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{{Short description|Genus of fungi}}
{{Automatic taxobox
{{Automatic taxobox
| image = Russulamexicana.jpg
| image = Russulamexicana.jpg
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| authority = [[Christian Hendrik Persoon|Pers.]] (1797)
| authority = [[Christian Hendrik Persoon|Pers.]] (1797)
| type_species = ''[[Russula emetica]]''
| type_species = ''[[Russula emetica]]''
| type_species_authority = ([[Schaeff.]]) Pers. (1796)
| type_species_authority = ([[Schaeff.]]) [[Christian Hendrik Persoon|Pers.]] (1796)
| diversity = c. 700 species
| diversity = c. 700 species
| diversity_link = List of Russula species
| diversity_link = List of Russula species
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}}
}}


Around 750 worldwide species of [[ectomycorrhiza]]l mushrooms compose the [[genus]] '''''Russula'''''. They are typically common, fairly large, and brightly colored – making them one of the most recognizable genera among mycologists and mushroom collectors. Their distinguishing characteristics include usually brightly coloured caps, a white to dark yellow [[spore print]], brittle, attached [[gill (mushroom)|gills]], an absence of [[latex]], and absence of [[partial veil]] or [[universal veil|volva]] tissue on the stem. Microscopically, the genus is characterised by the [[amyloid]] ornamented spores and flesh (trama) composed of spherocysts. Members of the related genus ''[[Lactarius]]'' have similar characteristics but emit a milky [[latex]] when their gills are broken. The genus was described by [[Christian Hendrik Persoon]] in 1796.
'''''Russula''''' is a very large [[genus]] composed of around 750 worldwide species of [[ectomycorrhiza]]l mushrooms. They are typically common, fairly large, and brightly colored – making them one of the most recognizable genera among mycologists and mushroom collectors. Their distinguishing characteristics include usually brightly coloured caps, a white to dark yellow [[spore print]], brittle, attached [[gill (mushroom)|gills]], an absence of [[latex]], and absence of [[partial veil]] or [[universal veil|volva]] tissue on the stem. Microscopically, the genus is characterised by the [[amyloid]] ornamented spores and flesh (trama) composed of spherocysts. Members of the related genus ''[[Lactarius (fungus)|Lactarius]]'' have similar characteristics but emit a milky [[latex]] when their gills are broken. The genus was described by [[Christian Hendrik Persoon]] in 1796.


==Taxonomy==
==Taxonomy==
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*other microscopic characteristics, such as the appearance of the [[cystidium|cystidia]] in various mounting reagents.
*other microscopic characteristics, such as the appearance of the [[cystidium|cystidia]] in various mounting reagents.


Despite the difficulty in positively identifying collected specimens, the possibility to spot the toxic species by their acrid taste makes some of the mild species, such as ''[[Russula cyanoxantha|R.&nbsp;cyanoxantha]]'' and ''[[Russula vesca|R. vesca]]'', popular edible mushrooms. ''Russula'' is mostly free of deadly poisonous species, and mild-tasting ones are all edible.<ref>See [http://www.mtsn.tn.it/russulales-news/in_edibility.asp "Russulales News", "Edibility and toxicity of Russulales" page, "5.1.2. Edible Russulae" section] {{webarchive|url=https://web.archive.org/web/20070822112146/http://www.mtsn.tn.it/russulales-news/in_edibility.asp |date=2007-08-22 }}.</ref>
Despite the difficulty in positively identifying collected specimens, the possibility to spot the toxic species by their acrid taste makes some of the mild species, such as ''[[Russula cyanoxantha|R.&nbsp;cyanoxantha]]'' and ''[[Russula vesca|R. vesca]]'', popular edible mushrooms. ''Russula'' is mostly free of deadly poisonous species, and mild-tasting ones are all edible.<ref>See [http://www.mtsn.tn.it/russulales-news/in_edibility.asp "Russulales News", "Edibility and toxicity of Russulales" page, "5.1.2. Edible Russulae" section] {{webarchive|url=https://web.archive.org/web/20070822112146/http://www.mtsn.tn.it/russulales-news/in_edibility.asp |date=2007-08-22 }}.</ref>{{Failed verification|date=July 2024}}


==Ecology==
==Ecology==
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In Madagascar, species collected from introduced eucalypt forests include ''[[Russula madecassense]]'', ''[[Russula prolifica]]'', and several other species of minor importance, including some that have not yet been officially described.<ref>Dugan (2011), p. 69.</ref> ''Russula'' is the most commonly consumed and economically important mushroom genus in [[Madagascar]], particularly ''[[Russula prolifica]]'' and ''[[Russula edulis]]''. This and other edible Russula are typically stripped of their cap cuticle before selling to make them more similar in appearance to the ''[[Agaricus bisporus]]''.<ref name="Buyck 2008" /> In [[Tanzania]], ''[[Russula cellulata]]'' and ''[[Russula ciliata]]'' are sometimes used as food.<ref>Dugan (2011), p. 70.</ref>
In Madagascar, species collected from introduced eucalypt forests include ''[[Russula madecassense]]'', ''[[Russula prolifica]]'', and several other species of minor importance, including some that have not yet been officially described.<ref>Dugan (2011), p. 69.</ref> ''Russula'' is the most commonly consumed and economically important mushroom genus in [[Madagascar]], particularly ''[[Russula prolifica]]'' and ''[[Russula edulis]]''. This and other edible Russula are typically stripped of their cap cuticle before selling to make them more similar in appearance to the ''[[Agaricus bisporus]]''.<ref name="Buyck 2008" /> In [[Tanzania]], ''[[Russula cellulata]]'' and ''[[Russula ciliata]]'' are sometimes used as food.<ref>Dugan (2011), p. 70.</ref>


''[[Russula cyanoxantha]]'' is a popular edible throughout Asia, Europe, and the Pacific.<ref>Dugan (2011), pp. 46, 62.</ref> In Finland, commonly eaten species include (but are not limited to) ''[[Russula vinosa]]'', ''[[Russula vesca]], [[Russula paludosa]], [[Russula decolorans]], [[Russula xerampelina]]'' and ''[[Russula claroflava]].<ref>{{Cite news|url=https://www.evira.fi/elintarvikkeet/valmistus-ja-myynti/elintarvikeryhmat/ruokasienet/kauppasienet/|title=Suositeltavat ruokasienet|work=Evira|access-date=2018-08-20|language=fi}}</ref>''
''[[Russula cyanoxantha]]'' is a popular edible throughout Asia, Europe, and the Pacific.<ref>Dugan (2011), pp. 46, 62.</ref> In Finland, commonly eaten species include (but are not limited to) ''[[Russula vinosa]]'', ''[[Russula vesca]], [[Russula paludosa]], [[Russula decolorans]], [[Russula xerampelina]]'' and ''[[Russula claroflava]].<ref>{{Cite news|url=https://www.evira.fi/elintarvikkeet/valmistus-ja-myynti/elintarvikeryhmat/ruokasienet/kauppasienet/|title=Suositeltavat ruokasienet|work=Evira|access-date=2018-08-20|language=fi|archive-date=2017-11-15|archive-url=https://web.archive.org/web/20171115225634/https://www.evira.fi/elintarvikkeet/valmistus-ja-myynti/elintarvikeryhmat/ruokasienet/kauppasienet/|url-status=dead}}</ref>''


In Thailand, russulas collected by locals and sold in roadsides and local markets include ''[[Russula alboareolata]]'', ''[[Russula lepida]]'', ''[[Russula nigricans]]'', ''[[Russula virescens]]'', and ''[[Russula xerampelina]]''.<ref>Dugan (2011), p. 58.</ref> Edible russulas in [[Nepal]] include ''[[Russula flavida]]'' and ''[[Russula chlorides]]''.<ref>Dugan (2011), p. 57.</ref> The tropical Chinese species ''[[Russula griseocarnea]]'', misidentified as the European ''[[Russula vinosa|R.&nbsp;vinosa]]'' until 2009, is commercially collected as food and medicine.<ref name="Wang 2009" />
In Thailand, russulas collected by locals and sold in roadsides and local markets include ''[[Russula alboareolata]]'', ''[[Russula lepida]]'', ''[[Russula nigricans]]'', ''[[Russula virescens]]'', and ''[[Russula xerampelina]]''.<ref>Dugan (2011), p. 58.</ref> Edible russulas in [[Nepal]] include ''[[Russula flavida]]'' and ''[[Russula chlorides]]''.<ref>Dugan (2011), p. 57.</ref> The tropical Chinese species ''[[Russula griseocarnosa]]'', misidentified as the European ''[[Russula vinosa|R.&nbsp;vinosa]]'' until 2009, is commercially collected as food and medicine.<ref name="Wang 2009" />


===Toxicity===
===Toxicity===
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==Sequestrate species==
==Sequestrate species==
The description of ''Russula'' was changed in 2007 when molecular analysis revealed that several [[Secotioid|sequestrate]] species formerly classified in ''Macowanites'' (syn. ''Elasmomyces''<ref name="Lebel 2000"/>) were shown to lie within ''Russula''. The type species of ''Macowanites'', ''[[Russula agaricina|Macowanites agaricinus]]'', was transferred and several new species were added: ''[[Russula albidoflava]]'', ''[[Russula albobrunnea|R.&nbsp;albobrunnea]]'', ''[[Russula brunneonigra|R.&nbsp;brunneonigra]]'', ''[[Russula galbana|R.&nbsp;galbana]]'', ''[[Russula pumicoidea|R.&nbsp;pumicoidea]]'', ''[[Russula reddellii|R.&nbsp;reddellii]]'', ''[[Russula reddelli|R.&nbsp;reddellii]]'', ''[[Russula sinuata|R.&nbsp;sinuata]]'', and ''[[Russula variispora|R.&nbsp;variispora]]''.<ref name="Lebel 2007"/> The genus names ''Gymnomyces'' and ''Martellia'', formerly used for sequestrate species, are now accepted synonyms of ''Russula'',<ref name="urlMycoBank"/> The genus ''[[Cystangium]]'' is also probably a synonym of ''Russula'' but is still in use.<ref name="Trierveiler-Pereira 2014"/><ref name="Buyck 2010"/>
The description of ''Russula'' was changed in 2007 when molecular analysis revealed that several [[Secotioid|sequestrate]] species formerly classified in ''Macowanites'' (syn. ''Elasmomyces''<ref name="Lebel 2000"/>) were shown to lie within ''Russula''. The type species of ''Macowanites'', ''[[Russula agaricina|Macowanites agaricinus]]'', was transferred and several new species were added: ''[[Russula albidoflava]]'', ''[[Russula albobrunnea|R.&nbsp;albobrunnea]]'', ''[[Russula brunneonigra|R.&nbsp;brunneonigra]]'', ''[[Russula galbana|R.&nbsp;galbana]]'', ''[[Russula pumicoidea|R.&nbsp;pumicoidea]]'', ''[[Russula reddellii|R.&nbsp;reddellii]]'', ''[[Russula sinuata|R.&nbsp;sinuata]]'', and ''[[Russula variispora|R.&nbsp;variispora]]''.<ref name="Lebel 2007"/> The genus names ''Gymnomyces'' and ''Martellia'', formerly used for sequestrate species, are now accepted synonyms of ''Russula'',<ref name="urlMycoBank"/> The genus ''[[Cystangium]]'' is also probably a synonym of ''Russula'' but is still in use.<ref name="Trierveiler-Pereira 2014"/><ref name="Buyck 2010"/>


==Notable species==
==Notable species==
[[File:Russula chloroides.jpg|thumb|right|''R. chloroides'']]
[[File:Russula chloroides.jpg|thumb|right|''R. chloroides'']]
:''For more examples, see the [[List of Russula species]].''
{{further|List of Russula species}}
*''[[Russula cyanoxantha]]'' – high quality edible with blue to greenish cap, mild taste and white, greasy gills.
*''[[Russula cyanoxantha]]'' – high quality edible with blue to greenish cap, mild taste and white, greasy gills.
*''[[Russula emetica]]''
*''[[Russula emetica]]''
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<ref name="Busuioc 2013">{{cite journal |vauthors=Busuioc G, Elekes C |title=Response of four ''Russula'' species under copper sulphate and lead acetate treatments |journal= Notulae Botanicae Horti Agrobotanici Cluj-Napoca|year=2013 |volume=41 |issue=2 |pages=538–45 |url=http://www.notulaebotanicae.ro/index.php/nbha/article/viewFile/9146/7666 |format=PDF|doi=10.15835/nbha4129146 |doi-access=free }}</ref>
<ref name="Busuioc 2013">{{cite journal |vauthors=Busuioc G, Elekes C |title=Response of four ''Russula'' species under copper sulphate and lead acetate treatments |journal= Notulae Botanicae Horti Agrobotanici Cluj-Napoca|year=2013 |volume=41 |issue=2 |pages=538–45 |url=http://www.notulaebotanicae.ro/index.php/nbha/article/viewFile/9146/7666 |format=PDF|doi=10.15835/nbha4129146 |doi-access=free }}</ref>


<ref name="Buyck 2008">{{cite journal |author=Buyck B. |title=The edible mushrooms of Madagascar: An evolving enigma |journal=Economic Botany |year=2008 |volume=62 |issue=3 |pages=509–520 |doi=10.1007/s12231-008-9029-4}}</ref>
<ref name="Buyck 2008">{{cite journal |author=Buyck B. |title=The edible mushrooms of Madagascar: An evolving enigma |journal=Economic Botany |year=2008 |volume=62 |issue=3 |pages=509–520 |doi=10.1007/s12231-008-9029-4|bibcode=2008EcBot..62..509B |s2cid=39119949 }}</ref>


<ref name="Buyck 2010">{{Cite journal |vauthors=Buyck B, Hofstetter V, Verbeken A, Walleyn R |title=Proposal to conserve ''Lactarius'' nom. cons. (Basidiomycota) with conserved type |journal=Taxon |volume=59 |year=2010 |pages=447–453 |doi=10.1002/tax.591031 |doi-access=free }} {{open access}}</ref>
<ref name="Buyck 2010">{{Cite journal |vauthors=Buyck B, Hofstetter V, Verbeken A, Walleyn R |title=Proposal to conserve ''Lactarius'' nom. cons. (Basidiomycota) with conserved type |journal=Taxon |volume=59 |year=2010 |pages=447–453 |doi=10.1002/tax.591031 |doi-access=free }} {{open access}}</ref>
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<!-- protolog reference for Elasmomyces
<!-- protolog reference for Elasmomyces
<ref name="Cavara 1897">{{cite journal |author=Cavara F. |title=Contributo alla conoscenza delle Podazineae (Elasmomyces mattirolianus nov. gen. et sp.) |journal=Malpighia |year=1897 |volume=11 |pages=414–28 |language=Italian |url=https://www.biodiversitylibrary.org/page/34835251}}</ref>
<ref name="Cavara 1897">{{cite journal |author=Cavara F. |title=Contributo alla conoscenza delle Podazineae (Elasmomyces mattirolianus nov. gen. et sp.) |journal=Malpighia |year=1897 |volume=11 |pages=414–28 |language=it |url=https://www.biodiversitylibrary.org/page/34835251}}</ref>
-->
-->


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-->
-->


<ref name="Drewnowska 2012">{{cite journal |vauthors=Drewnowska M, Sąpór A, Jarzyńska G, Nnorom IC, Sajwan KS, Falandysz J |title=Mercury in ''Russula'' mushrooms: Bioconcentration by Yellow-ocher Brittle Gills ''Russula ochroleuca'' |journal=Journal of Environmental Science and Health, Part A |year=2012 |volume=47 |issue=11 |pages=1577–91 |doi=10.1080/10934529.2012.680420 |pmid=22702818}}</ref>
<ref name="Drewnowska 2012">{{cite journal |vauthors=Drewnowska M, Sąpór A, Jarzyńska G, Nnorom IC, Sajwan KS, Falandysz J |title=Mercury in ''Russula'' mushrooms: Bioconcentration by Yellow-ocher Brittle Gills ''Russula ochroleuca'' |journal=Journal of Environmental Science and Health, Part A |year=2012 |volume=47 |issue=11 |pages=1577–91 |doi=10.1080/10934529.2012.680420 |pmid=22702818|bibcode=2012JESHA..47.1577D |s2cid=27097507 }}</ref>


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<ref name="Earle 1909">{{cite journal |author=Earle FS. |title=The genera of North American gill fungi |journal=Bulletin of the New York Botanical Garden |year=1909 |volume=5 |pages=373–451 (see p9.&nbsp;409–10) |url=https://www.biodiversitylibrary.org/page/31042582}}</ref>
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<ref name="Hennings 1901">{{cite journal |author=Hennings P. |title=Beiträge zur Flora von Afrika. XXI. Fungi. camerunenses novi. III |journal=Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie |year=1901 |volume=30 |pages=39–57 |language=de |url=https://www.biodiversitylibrary.org/page/211262}}</ref>


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<ref name="Leonhardt 2014">{{cite journal |vauthors=Leonhardt T, Sácký J, Šimek P, Šantrůček J, Kotrba P |title=Metallothionein-like peptides involved in sequestration of Zn in the Zn-accumulating ectomycorrhizal fungus ''Russula atropurpurea'' |journal=Metallomics |year=2014 |volume=6 |issue=9 |pages=1693–701 |doi=10.1039/c4mt00141a |pmid=24992964|doi-access=free }}</ref>
<ref name="Leonhardt 2014">{{cite journal |vauthors=Leonhardt T, Sácký J, Šimek P, Šantrůček J, Kotrba P |title=Metallothionein-like peptides involved in sequestration of Zn in the Zn-accumulating ectomycorrhizal fungus ''Russula atropurpurea'' |journal=Metallomics |year=2014 |volume=6 |issue=9 |pages=1693–701 |doi=10.1039/c4mt00141a |pmid=24992964|doi-access=free }}</ref>


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<ref name="Lohwag 1924">{{cite journal |author=Lohwag H. |title=Entwicklungsgeschichte und systematische Stellung von Secotium agaricoides (Czern.) Holl |journal=Österreichische Botanische Zeitschrift |year=1924 |volume=73 |issue=7–9 |pages=161–74 |language=de |doi=10.1007/bf01634995|s2cid=27240181 }}</ref>


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<ref name="Roberts 2004">{{cite journal |vauthors=Roberts C, Ceska O, Kroeger P, Kendrick BW |year=2004 |title=Macrofungi from six habitats over five years in Clayoquot Sound, Vancouver Island |journal=Canadian Journal of Botany |volume=82 |pages=1518–1538 |doi=10.1139/B04-114 |issue=10}}</ref>
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<ref name="Tan 2004">{{cite journal |vauthors=Tan JW, Xu JB, Dong ZJ, Luo DQ, Liu JK |title=Nigricanin, the first ellagic acid derived metabolite from the basidiomycete ''Russula nigricans'' |journal=Helvetica Chimica Acta |year=2004 |volume=87 |issue=4 |pages=1025–1029 |doi=10.1002/hlca.200490074}}</ref>
<ref name="Tan 2004">{{cite journal |vauthors=Tan JW, Xu JB, Dong ZJ, Luo DQ, Liu JK |title=Nigricanin, the first ellagic acid derived metabolite from the basidiomycete ''Russula nigricans'' |journal=Helvetica Chimica Acta |year=2004 |volume=87 |issue=4 |pages=1025–1029 |doi=10.1002/hlca.200490074}}</ref>


<ref name="Trappe 1962">{{cite journal |author=Trappe JM. |title=Fungus associates of ectotrophic mycorrhizae |journal=Botanical Review |year=1962 |volume=28 |issue=4 |pages=538–606 |jstor=4353659 |doi=10.1007/bf02868758}}</ref>
<ref name="Trappe 1962">{{cite journal |author=Trappe JM. |title=Fungus associates of ectotrophic mycorrhizae |journal=Botanical Review |year=1962 |volume=28 |issue=4 |pages=538–606 |jstor=4353659 |doi=10.1007/bf02868758|bibcode=1962BotRv..28..538T |s2cid=42698903 }}</ref>


<ref name="Trierveiler-Pereira 2014">{{cite journal |vauthors=Trierveiler-Pereira L, Smith ME, Trappe JM, Nouhra E |title=Sequestrate fungi from Patagonian ''Nothofagus'' forests: ''Cystangium'' (Russulaceae, Basidiomycota) |journal=Mycologia |year=2014 |doi=10.3852/13-302 |volume=107 |issue=1 |pages=90–103 |pmid=25232070|url=https://semanticscholar.org/paper/0d48bd545ad4898fc325635cab1f31629d8ac5ae }}</ref>
<ref name="Trierveiler-Pereira 2014">{{cite journal |vauthors=Trierveiler-Pereira L, Smith ME, Trappe JM, Nouhra E |title=Sequestrate fungi from Patagonian ''Nothofagus'' forests: ''Cystangium'' (Russulaceae, Basidiomycota) |journal=Mycologia |year=2014 |doi=10.3852/13-302 |volume=107 |issue=1 |pages=90–103 |pmid=25232070|s2cid=9078246 |hdl=11336/12605 |hdl-access=free }}</ref>


<ref name="urlMycoBank">{{cite web |title=MycoBank: ''Russula'' |url=http://www.mycobank.org/BioloMICS.aspx?Table=Mycobank&Rec=57329&Fields=All |publisher=MycoBank |accessdate=2014-11-29}}</ref>
<ref name="urlMycoBank">{{cite web |title=MycoBank: ''Russula'' |url=http://www.mycobank.org/BioloMICS.aspx?Table=Mycobank&Rec=57329&Fields=All |publisher=MycoBank |access-date=2014-11-29}}</ref>


<ref name="Vidari 1998">{{cite journal |vauthors=Vidari G, Che Z, Garlaschelli L |title=New nardosinane and aristolane sesquiterpenes from the fruiting bodies of ''Russula lepida'' |journal=Tetrahedron Letters |year=1998 |volume=39 |issue=33 |pages=6073–6076 |doi=10.1016/S0040-4039(98)01251-9}}</ref>
<ref name="Vidari 1998">{{cite journal |vauthors=Vidari G, Che Z, Garlaschelli L |title=New nardosinane and aristolane sesquiterpenes from the fruiting bodies of ''Russula lepida'' |journal=Tetrahedron Letters |year=1998 |volume=39 |issue=33 |pages=6073–6076 |doi=10.1016/S0040-4039(98)01251-9}}</ref>


<ref name="Wang 2005">{{cite journal |vauthors=Wang XN, Wang F, Du JC, Ge HM, Tan RX, Liu JK |title=A new marasmane sesquiterpene from the Basidiomycete ''Russula foetens'' |journal=Zeitschrift für Naturforschung |year=2005 |volume=60b |issue=10 |pages=1065–7 |url=http://www.znaturforsch.com/ab/v60b/s60b1065.pdf |doi=10.1515/znb-2005-1007 }}</ref>
<ref name="Wang 2005">{{cite journal |vauthors=Wang XN, Wang F, Du JC, Ge HM, Tan RX, Liu JK |title=A new marasmane sesquiterpene from the Basidiomycete ''Russula foetens'' |journal=Zeitschrift für Naturforschung |year=2005 |volume=60b |issue=10 |pages=1065–7 |url=http://www.znaturforsch.com/ab/v60b/s60b1065.pdf |doi=10.1515/znb-2005-1007 |s2cid=36019486 }}</ref>


<ref name="Wang 2009">{{cite journal |vauthors=Wang XH, Yang ZL, Li YC, Knudsen H, Liu PG |title=''Russula griseocarnosa'' sp. nov. (Russulaceae, Russulales), a commercially important edible mushroom in tropical China: mycorrhiza, phylogenetic position, and taxonomy |journal=Nova Hedwigia |year=2009 |volume=88 |issue=1–2 |pages=269–82 |doi=10.1127/0029-5035/2009/0088-0269}}</ref>
<ref name="Wang 2009">{{cite journal |vauthors=Wang XH, Yang ZL, Li YC, Knudsen H, Liu PG |title=''Russula griseocarnosa'' sp. nov. (Russulaceae, Russulales), a commercially important edible mushroom in tropical China: mycorrhiza, phylogenetic position, and taxonomy |journal=Nova Hedwigia |year=2009 |volume=88 |issue=1–2 |pages=269–82 |doi=10.1127/0029-5035/2009/0088-0269}}</ref>


<ref name="Yang 2006">{{cite journal |vauthors=Yang S, Pfister DH |title=''Monotropa uniflora'' plants of eastern Massachusetts form mycorrhizae with a diversity of russulacean fungi |journal=Mycologia |year=2006 |volume=98 |issue=4 |pages=535–540 |doi=10.3852/mycologia.98.4.535 |url= https://semanticscholar.org/paper/9e837499686f1ac90d47f3fb3d0dee4f1dc00cb9|pmid=17139846}}</ref>
<ref name="Yang 2006">{{cite journal |vauthors=Yang S, Pfister DH |title=''Monotropa uniflora'' plants of eastern Massachusetts form mycorrhizae with a diversity of russulacean fungi |journal=Mycologia |year=2006 |volume=98 |issue=4 |pages=535–540 |doi=10.3852/mycologia.98.4.535 |pmid=17139846|s2cid=39886589 }}</ref>


<ref name="Zhang 2010">{{cite journal |author=Zhang G, Sun, J, Wang H, Ng TB. |title=First isolation and characterization of a novel lectin with potent antitumor activity from a ''Russula'' mushroom |journal=Phytomedicine |year=2010 |volume=17 |issue=10 |pages=775–781 |doi=10.1016/j.phymed.2010.02.001|pmid=20378319 }}</ref>
<ref name="Zhang 2010">{{cite journal |author=Zhang G, Sun, J, Wang H, Ng TB. |title=First isolation and characterization of a novel lectin with potent antitumor activity from a ''Russula'' mushroom |journal=Phytomedicine |year=2010 |volume=17 |issue=10 |pages=775–781 |doi=10.1016/j.phymed.2010.02.001|pmid=20378319 }}</ref>
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[[Category:Russulales genera]]
[[Category:Russulales genera]]
[[Category:Taxa named by Christiaan Hendrik Persoon]]
[[Category:Taxa named by Christiaan Hendrik Persoon]]
[[Category:Taxa described in 1797]]

Latest revision as of 09:42, 7 August 2024

Russula
The sickener (R. emetica group)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Russulales
Family: Russulaceae
Genus: Russula
Pers. (1797)
Type species
Russula emetica
(Schaeff.) Pers. (1796)
Diversity
c. 700 species
Synonyms[1]

Russula is a very large genus composed of around 750 worldwide species of ectomycorrhizal mushrooms. They are typically common, fairly large, and brightly colored – making them one of the most recognizable genera among mycologists and mushroom collectors. Their distinguishing characteristics include usually brightly coloured caps, a white to dark yellow spore print, brittle, attached gills, an absence of latex, and absence of partial veil or volva tissue on the stem. Microscopically, the genus is characterised by the amyloid ornamented spores and flesh (trama) composed of spherocysts. Members of the related genus Lactarius have similar characteristics but emit a milky latex when their gills are broken. The genus was described by Christian Hendrik Persoon in 1796.

Taxonomy

[edit]

Christian Hendrik Persoon first circumscribed the genus Russula in his 1796 work Observationes Mycologicae, and considered the defining characteristics to be the fleshy fruit bodies, depressed cap, and equal gills.[9] He reduced it to the rank of tribe in the genus Agaricus in 1801. Elias Fries similarly regarded Russula as a tribe of Agaricus in his influential Systema Mycologicum (1821), but later (1825) raised it to the rank of genus in the Systema Orbis Vegetabilis. Around the same time, Samuel Frederick Gray also recognized Russula as a genus in his 1821 work The Natural Arrangement of British Plants.[10] The name Russula is derived from the Latin word russus, meaning "red".[11]

Identification

[edit]

"If we know of any one, who in the pride of intellect spurned all mental tasks as mere play, we would tame him by insisting on his mastering, classifying and explaining the synonyms of the genus Russula."

R. flavida, Mexico

Like the genus Lactarius, russulas have a distinctive flesh consistency, which is also reflected in the appearance of the gills and stipe, and normally makes them immediately recognizable. They have no trace of a veil (no ring, or veil remnants on the cap). The gills are brittle except in a few cases, and cannot be bent parallel with the cap without breaking. Hence the genus Russula is sometimes known colloquially as "brittle gills".[12] They have splitting gills and do not exude a milky substance at cut surfaces, contrary to the genus Lactarius. Presence of large spherical cells, 'sphaerocysts', in the stipe is an important characteristic feature to distinguish the members of Russulaceae from other mushrooms. In Russula, the stipe breaks like the flesh of an apple, while in most other families it only breaks into fibres.[13] The spore powder varies from white to cream, or even orange.

While it is relatively easy to identify a sample mushroom as belonging to this genus, it is a significant challenge to distinguish member species of Russula. This task often requires microscopic characteristics, and subtle subjective distinctions, such as the difference between a mild to bitter and a mild to acrid flavor. Moreover, the exact phylogenetic relationships of these mushrooms have yet to be resolved in the professional mycological community, and may ultimately depend on DNA sequencing analysis.

The following characteristics are often important in identifying individual species:

  • the exact colour of the spore powder (white/cream/ochre),
  • the taste (mild/bitter/acrid),
  • colour changes in the flesh,
  • the distance from the centre to which the cap skin can be pulled off: (peeling percentage).
  • cap colour (but this is often very variable within one species),
  • reaction of the flesh to ferrous sulphate (FeSO4), formalin, alkalis, and other chemicals,
  • ornamentation of the spores, and
  • other microscopic characteristics, such as the appearance of the cystidia in various mounting reagents.

Despite the difficulty in positively identifying collected specimens, the possibility to spot the toxic species by their acrid taste makes some of the mild species, such as R. cyanoxantha and R. vesca, popular edible mushrooms. Russula is mostly free of deadly poisonous species, and mild-tasting ones are all edible.[14][failed verification]

Ecology

[edit]

All Russula species are ectomycorrhizal symbionts with higher plants and trees, and the genus has a collectively diverse host range.[15] Some species are cosmopolitan and capable of forming associations with one or more hosts in a range of habitats, while others are more constrained in either host or habitat or both.[16] The mycoheterotrophic plant Monotropa uniflora associates with a small range of fungal hosts, all of them members of Russulaceae, including 18 species of Russula.[17]

Russula fruit bodies provide a seasonal food source for slugs, squirrels and deer.[18][19][20][21]

Some russulas can bioaccumulate high levels of toxic metals from their environment. For example, Russula atropurpurea is capable of concentrating zinc, a property attributed to the presence of metallothionein-like peptides in the mushroom.[22] Russula nigricans can accumulate lead to a level up to five times more concentrated than the soil it grows in,[23] while R. ochroleuca concentrates environmental mercury.[24]

Edibility

[edit]
Lobster mushroom

Humans collect several species of Russula for food. There is a cultural divide toward interpretation of Russula edibility. In general, North American field guides tend to list mostly non-edible species and advise caution when consuming any member of the genus. In contrast, European field guides have a more favorable opinion and list more edible species.[12]

In the Pacific Northwest region of North America, only Russula brevipes parasitized with Hypomyces lactifluorum—known as lobster mushroom—is collected commercially. Several Russula species are sold in the markets of Izta-Popo Zoquiapan National Park (central Mexico): R. brevipes, R. cyanoxantha, R. mexicana and R. olivacea. In Tlaxcala, wild species sold in market include R. alutacea, R. cyanoxantha, R. delica, R. mariae, R. olivacea, R. romagnesia, and R. xerampelina.[25]

In Madagascar, species collected from introduced eucalypt forests include Russula madecassense, Russula prolifica, and several other species of minor importance, including some that have not yet been officially described.[26] Russula is the most commonly consumed and economically important mushroom genus in Madagascar, particularly Russula prolifica and Russula edulis. This and other edible Russula are typically stripped of their cap cuticle before selling to make them more similar in appearance to the Agaricus bisporus.[27] In Tanzania, Russula cellulata and Russula ciliata are sometimes used as food.[28]

Russula cyanoxantha is a popular edible throughout Asia, Europe, and the Pacific.[29] In Finland, commonly eaten species include (but are not limited to) Russula vinosa, Russula vesca, Russula paludosa, Russula decolorans, Russula xerampelina and Russula claroflava.[30]

In Thailand, russulas collected by locals and sold in roadsides and local markets include Russula alboareolata, Russula lepida, Russula nigricans, Russula virescens, and Russula xerampelina.[31] Edible russulas in Nepal include Russula flavida and Russula chlorides.[32] The tropical Chinese species Russula griseocarnosa, misidentified as the European R. vinosa until 2009, is commercially collected as food and medicine.[33]

Toxicity

[edit]

The main pattern of toxicity seen among Russula species to date has been gastrointestinal symptoms in those with a spicy (acrid) taste when eaten raw or undercooked; many of these are red-capped species such as R. emetica, R. sardonia and R. nobilis. The Asian species Russula subnigricans has been the cause of several fatal cases of rhabdomyolysis in Japan.[34] Several active agents have been isolated from the species, including russuphelin A[35] and cycloprop-2-ene carboxylic acid.[36]

Natural products

[edit]

Despite the large number of species, the secondary metabolites of Russula have not been well investigated, especially compared to Lactarius. Russula foetens was shown to produce the marasmane sesquiterpenes Lactapiperanol A and Lactapiperanol E.[37] A novel lectin with potent in vitro antitumor activity was isolated from Russula rosea, the first lectin reported from a Russula.[38] This mushroom is also the source of the sesquiterpenes rulepidanol and rulepidadienes A and B.[39] Russula nigricans contains the compound nigricanin, the first ellagic acid derivative isolated from higher fungi.[40]

Sequestrate species

[edit]

The description of Russula was changed in 2007 when molecular analysis revealed that several sequestrate species formerly classified in Macowanites (syn. Elasmomyces[41]) were shown to lie within Russula. The type species of Macowanites, Macowanites agaricinus, was transferred and several new species were added: Russula albidoflava, R. albobrunnea, R. brunneonigra, R. galbana, R. pumicoidea, R. reddellii, R. sinuata, and R. variispora.[5] The genus names Gymnomyces and Martellia, formerly used for sequestrate species, are now accepted synonyms of Russula,[1] The genus Cystangium is also probably a synonym of Russula but is still in use.[42][43]

Notable species

[edit]
R. chloroides
Further information: List of Russula species

See also

[edit]

References

[edit]
  1. ^ a b "MycoBank: Russula". MycoBank. Retrieved 2014-11-29.
  2. ^ Lohwag H. (1924). "Entwicklungsgeschichte und systematische Stellung von Secotium agaricoides (Czern.) Holl". Österreichische Botanische Zeitschrift (in German). 73 (7–9): 161–74. doi:10.1007/bf01634995. S2CID 27240181.
  3. ^ a b c Earle FS. (1909). "The genera of North American gill fungi". Bulletin of the New York Botanical Garden. 5: 373–451 (see p9. 409–10).
  4. ^ Massee GE. (1898). "Fungi exotici, I". Bulletin of Miscellaneous Informations of the Royal Botanical Gardens Kew. 1898 (138): 113–136. doi:10.2307/4115483. JSTOR 4115483. Open access icon
  5. ^ a b Lebel T, Tonkin JE (2007). "Australasian species of Macowanites are sequestrate species of Russula (Russulaceae, Basidiomycota)". Australian Systematic Botany. 20 (4): 355–381. doi:10.1071/SB07007. Closed access icon
  6. ^ Mattirolo O. (1900). "Gli ipogei di Sardegna e di Sicilia". Malpighia (in Italian). 14: 39–110 (see p. 78).
  7. ^ Hennings P. (1901). "Beiträge zur Flora von Afrika. XXI. Fungi. camerunenses novi. III". Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie (in German). 30: 39–57.
  8. ^ Schröter J. (1889). Kryptogamen-Flora von Schlesien. Vol. 3-1(5). Lehre, Germany: Cramer. p. 549.
  9. ^ Persoon CH. (1796). Observationes mycologicae (in Latin). Leipzig, Germany: Apud Petrum Phillippum Wolf. p. 100. Archived from the original on 2014-12-05. Retrieved 2014-11-27. Pileus carnorufus, utplurimum depressus; Lamellae longitudine aequales.
  10. ^ Gray SF. (1821). A Natural Arrangement of British Plants. Vol. 1. London, UK: Baldwin, Cradock and Joy. p. 618.
  11. ^ Schalkwijk-Barendsen HME. (1991). Mushrooms of Western Canada. Edmonton, Canada: Lone Pine Publishing. p. 208. ISBN 978-0-919433-47-2.
  12. ^ a b Marley G. (2010). Chanterelle Dreams, Amanita Nightmares: The Love, Lore, and Mystique of Mushrooms. Chelsea Green Publishing. p. 20. ISBN 978-1-60358-280-3.
  13. ^ Mohanan C. (2011). Macrofungi of Kerala. Kerala, India: Kerala Forest Research Institute. p. 597. ISBN 978-81-85041-73-5.
  14. ^ See "Russulales News", "Edibility and toxicity of Russulales" page, "5.1.2. Edible Russulae" section Archived 2007-08-22 at the Wayback Machine.
  15. ^ Trappe JM. (1962). "Fungus associates of ectotrophic mycorrhizae". Botanical Review. 28 (4): 538–606. Bibcode:1962BotRv..28..538T. doi:10.1007/bf02868758. JSTOR 4353659. S2CID 42698903.
  16. ^ Roberts C, Ceska O, Kroeger P, Kendrick BW (2004). "Macrofungi from six habitats over five years in Clayoquot Sound, Vancouver Island". Canadian Journal of Botany. 82 (10): 1518–1538. doi:10.1139/B04-114.
  17. ^ Yang S, Pfister DH (2006). "Monotropa uniflora plants of eastern Massachusetts form mycorrhizae with a diversity of russulacean fungi". Mycologia. 98 (4): 535–540. doi:10.3852/mycologia.98.4.535. PMID 17139846. S2CID 39886589.
  18. ^ Cazares E, Trappe JM (1994). "Spore dispersal of hypogeous, ectomycorrhizal fungi on a glacier forefront by mammal mycophagy". Mycologia. 86 (4): 507–510. doi:10.2307/3760743. JSTOR 3760743.
  19. ^ Maser C, Trappe JM, Nussbaum RA (1978). "Fungal-small mammal interrelationships with emphasis on Oregon coniferous forests" (PDF). Ecology. 59 (4): 799–809. Bibcode:1978Ecol...59..799M. doi:10.2307/1938784. JSTOR 1938784.
  20. ^ Maser C, Maser Z, Trappe JM (1985). "Food habits of the northern flying squirrel (Glaucomys sabrinus) in Oregon". Canadian Journal of Zoology. 63 (4): 1084–1088. doi:10.1139/z85-162. JSTOR 1938784.
  21. ^ Keller HW, Snell KL (2002). "Feeding activities of slugs on Myxomycetes and macrofungi". Mycologia. 94 (5): 757–760. doi:10.2307/3761690. JSTOR 3761690. PMID 21156549.
  22. ^ Leonhardt T, Sácký J, Šimek P, Šantrůček J, Kotrba P (2014). "Metallothionein-like peptides involved in sequestration of Zn in the Zn-accumulating ectomycorrhizal fungus Russula atropurpurea". Metallomics. 6 (9): 1693–701. doi:10.1039/c4mt00141a. PMID 24992964.
  23. ^ Busuioc G, Elekes C (2013). "Response of four Russula species under copper sulphate and lead acetate treatments" (PDF). Notulae Botanicae Horti Agrobotanici Cluj-Napoca. 41 (2): 538–45. doi:10.15835/nbha4129146.
  24. ^ Drewnowska M, Sąpór A, Jarzyńska G, Nnorom IC, Sajwan KS, Falandysz J (2012). "Mercury in Russula mushrooms: Bioconcentration by Yellow-ocher Brittle Gills Russula ochroleuca". Journal of Environmental Science and Health, Part A. 47 (11): 1577–91. Bibcode:2012JESHA..47.1577D. doi:10.1080/10934529.2012.680420. PMID 22702818. S2CID 27097507.
  25. ^ Dugan (2011), pp. 77–78.
  26. ^ Dugan (2011), p. 69.
  27. ^ Buyck B. (2008). "The edible mushrooms of Madagascar: An evolving enigma". Economic Botany. 62 (3): 509–520. Bibcode:2008EcBot..62..509B. doi:10.1007/s12231-008-9029-4. S2CID 39119949.
  28. ^ Dugan (2011), p. 70.
  29. ^ Dugan (2011), pp. 46, 62.
  30. ^ "Suositeltavat ruokasienet". Evira (in Finnish). Archived from the original on 2017-11-15. Retrieved 2018-08-20.
  31. ^ Dugan (2011), p. 58.
  32. ^ Dugan (2011), p. 57.
  33. ^ Wang XH, Yang ZL, Li YC, Knudsen H, Liu PG (2009). "Russula griseocarnosa sp. nov. (Russulaceae, Russulales), a commercially important edible mushroom in tropical China: mycorrhiza, phylogenetic position, and taxonomy". Nova Hedwigia. 88 (1–2): 269–82. doi:10.1127/0029-5035/2009/0088-0269.
  34. ^ Money NP. (2011). Mushroom. Oxford University Press. p. 118. ISBN 978-0-19-973256-2.
  35. ^ Takahashi A, Agatsuma T, Matsuda M, Ohta T, Nunozawa T, Endo T, Nozoe S (1992). "Russuphelin A, a new cytotoxic substance from the mushroom Russula subnigricans Hongo". Chemical & Pharmaceutical Bulletin. 40 (12): 3185–8. doi:10.1248/cpb.40.3185. PMID 1294320.
  36. ^ Matsuura M, Saikawa Y, Inui K, Nakae K, Igarashi M, Hashimoto K, Nakata M (2009). "Identification of the toxic trigger in mushroom poisoning". Nature Chemical Biology. 5 (7): 465–7. doi:10.1038/nchembio.179. PMID 19465932.
  37. ^ Wang XN, Wang F, Du JC, Ge HM, Tan RX, Liu JK (2005). "A new marasmane sesquiterpene from the Basidiomycete Russula foetens" (PDF). Zeitschrift für Naturforschung. 60b (10): 1065–7. doi:10.1515/znb-2005-1007. S2CID 36019486.
  38. ^ Zhang G, Sun, J, Wang H, Ng TB. (2010). "First isolation and characterization of a novel lectin with potent antitumor activity from a Russula mushroom". Phytomedicine. 17 (10): 775–781. doi:10.1016/j.phymed.2010.02.001. PMID 20378319.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  39. ^ Vidari G, Che Z, Garlaschelli L (1998). "New nardosinane and aristolane sesquiterpenes from the fruiting bodies of Russula lepida". Tetrahedron Letters. 39 (33): 6073–6076. doi:10.1016/S0040-4039(98)01251-9.
  40. ^ Tan JW, Xu JB, Dong ZJ, Luo DQ, Liu JK (2004). "Nigricanin, the first ellagic acid derived metabolite from the basidiomycete Russula nigricans". Helvetica Chimica Acta. 87 (4): 1025–1029. doi:10.1002/hlca.200490074.
  41. ^ Lebel T, Trappe JM (2000). "Type Studies of Sequestrate Russulales. I. Generic Type Species". Mycologia. 92 (6): 1188–1205. doi:10.2307/3761486. JSTOR 3761486.
  42. ^ Trierveiler-Pereira L, Smith ME, Trappe JM, Nouhra E (2014). "Sequestrate fungi from Patagonian Nothofagus forests: Cystangium (Russulaceae, Basidiomycota)". Mycologia. 107 (1): 90–103. doi:10.3852/13-302. hdl:11336/12605. PMID 25232070. S2CID 9078246.
  43. ^ Buyck B, Hofstetter V, Verbeken A, Walleyn R (2010). "Proposal to conserve Lactarius nom. cons. (Basidiomycota) with conserved type". Taxon. 59: 447–453. doi:10.1002/tax.591031. Open access icon

Cited literature

[edit]
  • Dugan FM. (2011). Conspectus of World Ethnomycology. St. Paul, Minnesota: American Phytopathological Society. ISBN 978-0-89054-395-5.
  • Arora, D. (1986). Mushrooms demystified: A comprehensive guide to the fleshy fungi, Berkeley: Ten Speed Press. pp. 83–103.
  • Kibby, G. & Fatto, R. (1990). Keys to the species of Russula in northeastern North America, Somerville, NJ: Kibby-Fatto Enterprises. 70 pp.
  • Weber, N. S. & Smith, A. H. (1985). A field guide to southern mushrooms, Ann Arbor: U Michigan P. 280 pp.
  • Moser, M. (1978) Basidiomycetes II: Röhrlinge und Blätterpilze, Gustav Fischer Verlag Stuttgart. English edition: Keys to Agarics and Boleti... published by Roger Phillips, London.
  • Partly translated from Dutch page.
[edit]
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