Volvopluteus earlei
| Volvopluteus earlei | |
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| Scientific classification | |
| Kingdom: | |
| Division: | |
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| Species: | V. earlei
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| Binomial name | |
| Volvopluteus earlei (Murrill) Vizzini, Contu & Justo (2011)
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| Synonyms[1] | |
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Volvariopsis earlei Murrill (1911) | |
Volvopluteus earlei | |
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 | Gills on hymenium |
 | Cap is ovate or flat |
 | Hymenium is free |
 | Stipe has a volva |
 | Spore print is pink to pinkish-brown |
 | Ecology is saprotrophic |
 | Edibility is unknown |
Volvopluteus earlei is a species of mushroom in the family Pluteaceae. It was previously known under the name Volvariella earlei but recent molecular studies have placed it in the Volvopluteus, a genus newly described in 2011. The cap of this mushroom is typically between 2.5–5 cm (1–2 in) in diameter, white and is markedly viscid when fresh. The gills start out as white but they soon turn pink. The stipe is white and has a volva at the base. Microscopic features and DNA sequence data are of great importance for separating this taxon from related species. V. earlei is a saprotrophic fungus that grows on grassy fields. It has been reported from North America, Europe and Africa.
Taxonomy
This species was originally described by American mycologist William Alphonso Murrill in 1911 based on three collections made by his colleague Franklin Sumner Earle in Santiago de las vegas (Cuba) a few years earlier.[2] It was originally described by Murrill in the genus Volvariopsis, created in the same publication, because at that time there was considerable confusion about which generic name was more appropriate for the mushrooms traditionally classified in the genus Volvariella. At the time of Murrill's proposal most species in this group were classified in the genus Volvaria erected by Paul Kummer in 1871,[3] but mycologists realized that the name Volvaria was already taken as it had been coined by Augustin Pyramus de Candolle for a genus of lichens in 1805.[4] A year later Murrill transferred his species of Volvariopsis to the genus Volvaria, citing practical concerns about usage of names for non-taxonomists: "A number of species of gill-fungi described by me from tropical America in Mycologia, 1911–1912, under genera not found in Saccardo's Sylloge, are here recombined for the benefit of those having or using herbaria arranged according to this work. Collectors, pathologists, and others who may not be intimately acquainted with taxonomic methods will probably find it more convenient to follow the one system until a comprehensive revison is completed, at least for some important groups".[5]
Ultimately, neither Volvaria nor Volvariopsis would be used as the correct name for this group. The generic name Volvariella, proposed by the Argentinean mycologist Carlos Luis Spegazzini in 1899,[6] would be adopted for this group in 1953 after a proposal to conserve Kummer’s Volvaria against De Candolle’s Volvaria was rejected by the Nomenclature Committee for Fungi[7] established under the principles of the International Code of Nomenclature for algae, fungi, and plants. The combination Volvariella earlei would be made by Robert L. Shaffer, who authored the first comprehensive monographic revision of Volvariella in North America in 1957.[8]
The phylogenetic study of Alfredo Justo and colleagues showed that Volvariella earlei is closely related to Volvariella gloiocephala and that this group of species constitutes a separate lineage from the majority of the species traditionally classified in Volvariella. Therefore this taxon was transferred to the newly proposed genus Volvopluteus.[9]
The specific epithet earlei comes from the surname of Franklin Sumner Earle, the collector of the original samples, to whom Murrill dedicated the species. The original specimens of this species are still preserved at the herbarium of the New York Botanical Garden.
Description
Macroscopic characters
The cap of Volvopluteus earlei is between 25 and 50 mm (1.0 and 2.0 in) in diameter, more or less ovate or hemispherical when young, then expanding to convex or flat. It can have a low, broad umbo in the center in old specimens; the surface is markedly viscid in fresh fruit bodies; the cap is pure white, but sometimes develops pale brown tinges with age. The gills are crowded together, free from attachment to the stipe, ventricose, and up to 6 mm broad; they are white when young but turn pink with age as the spores mature. The cylindrical stipe is 30–50 mm (1.2–2.0 in) long and 2–10 mm (0.1–0.4 in) wide, and broadening towards the base. Its surface is white, smooth or slightly pruinose (as if covered with a fine white powder). The sac-like volva is up to 20 mm (0.8 in) high, white and has a smooth surface. The context is white in the stipe and cap and it does not change color when bruised or exposed to air. The smell and taste of the flesh are described as indistinct or herbaceous. The spore print is pinkish-brown.[8][10][11]
Microscopic characters
The basidiospores are 11–16 by 8–11 µm, ellipsoid. Basidia are 20–40 by 8–16 µm, usually 4-spored but sometimes 2-spored basidia, and more rarely 1-spored, can also occur. Pleurocystidia are absent in most collections, if present they are scarce and similar to the cheilocystidia. Cheilocystidia are 30–70 by 10–35 µm, are clavate, fusiform or lageniform and usually each one is provided with an apical excrescence up to 40 µm long; they cover completely the gill edge. In form acystidiatus (N.C. Pathak) Vizzini & Contu both pleuro and cheilocystidia are completely absent.[12] Pileipellis is an ixocutis [13] (parallel hyphae wide embedded in a gelatinous matrix). Stipitipellis is a cutis [13] (parallel hyphae not embedded in a gelatinous matrix). Caulocystidia are sometimes present, and they are 65–140 by 10–25 µm, mostly cylindrical.[8][10][11]
Ecology
Volvopluteus earlei is a saprotrophic mushroom that grows in gardens and grassy fields. It was originally found in banana fields in Cuba.[2] In Africa,[14] Spain [10] and Italy[11][15] it has been reported mostly in urban or anthropogenic garden areas. It usually fruits in groups of several basidiocarps but it can also be found growing solitary.
Distribution
This species has been reported from Cuba, North Carolina, Mexico, Spain and Italy.[10] Molecular data have so far corroborated that the European and African collections correspond to the same species.[12]
Similar species
Molecular analyses of the internal transcribed spacer region clearly separate the four species currently recognized in Volvopluteus but morphological identification can be more difficult due to the sometimes overlapping morphological variation among the species. Size of the basidiocarps, color of the pileus, spore size, presence or absence of cystidia and morphology of the cystidia are the most important characters for morphological species delimitation in the genus. Volvopluteus gloiocephalus has larger basidiocarps (cap more than 50 mm in diameter) has pleurocystidia and the cheilocystidia lack long apical excrescences. Volvopluteus asiaticus is provided with pleurocystidia and has predominantly lageniform cheilocystidia without long apical excrescences. In Volvopluteus michiganensis pleurocystidia are also present and this species has smaller basidiospores, on average less than 12.5 µm long.[12]
References
- ^ "Volvopluteus earlei (Murrill) Vizzini, Contu & Justo 2011". MycoBank. International Mycological Association. Retrieved 2013-04-10.
- ^ a b William A. Murrill (1911). "The Agaricaceae of Tropical America IV". Mycologia. 3 (6): 271–282. JSTOR 3753496.
- ^ Paul Kummer (1871). Der Führer in die Pilzkunde : Anleitung zum methodischen, leichten und sichern Bestimmen der in Deutschland vorkommenden Pilze : mit Ausnahme der Schimmel- und allzu winzigen Schleim- und Kern-Pilzchen. Zerbst, Germany: Verlag von E. Luppe's Buchhandlung. p. 387.
- ^ Jean Baptiste Pierre Antoine de Monet de Lamarck & Augustin Pyramus de Candolle (1805). Flore française: ou, Descriptions succinctes de toutes les plantes qui croissent naturellement en France, disposées selon une novelle méthode d'analyse, et précédées par un exposé des principes élémentaires de la botanique. p. 572.
- ^ William A. Murrill (1912). "News and Notes". Mycologia. 4 (6): 327–332. JSTOR 3753290.
- ^ Carlos Luis Spegazzini (1899). "Fungi Argentini novi vel critici". Anales del Museo Nacional de Historia Natural de Buenos Aires. 6: 81–365.
- ^ Special Committee for Fungi (1953). "Disposition of Nomina Generica Conservanda for Fungi". Taxon. 2 (2): 29–32. JSTOR 1217581.
- ^ a b c Robert L. Shaffer (1957). "Volvariella in North America". Mycologia. 49 (4): 545–579. JSTOR 3756159.
- ^ Justo, A.; Vizzini A.; Minnis A.M.; Menolli Jr., N.; Capelari, M.; Rodríguez, O.; Malysheva, E.; Contu, M.; Ghignone, S; Hibbett, D.S. (2011). "Phylogeny of the Pluteaceae (Agaricales, Basidiomycota): Taxonomy and character evolution" (PDF). Fungal Biology. 115 (1): 1–20. doi:10.1016/j.funbio.2010.09.012. PMID 21215950.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ a b c d Alfredo Justo & Maria Luisa Castro (2010). "The genus Volvariella in Spain:V. dunensis comb. & stat. nov.and observations on V. earlei" (PDF). Mycotaxon. 112: 261–270.
- ^ a b c Tomaso Lezzi (2011). "Ritrovamento di Volvopluteus earlei (Murrill) Vizzini, Contu & Justo nell'Isola Polvese sul lago Trasimeno". Bollettino dell'Associazione Micologica ed Ecologica Romana. 82 (1): 26–31.
- ^ a b c d Alfredo Justo, Andrew M. Minnis,
Stefano Ghignone, Nelson Menolli Jr., Marina Capelari, Olivia Rodríguez, Ekaterina Malysheva, Marco Contu, Alfredo Vizzini (2011). "Species recognition in Pluteus and Volvopluteus (Pluteaceae, Agaricales): morphology, geography and phylogeny" (PDF). Mycological Progress. 10 (4): 453–479.
{{cite journal}}: line feed character in|author=at position 33 (help)CS1 maint: multiple names: authors list (link) - ^ a b Vellinga EC (1988). Glossary in Bas et al (ed) Flora Agaricina neerlandica vol. 1 (1st ed.). Rotterdam, Netherlands: AA Balkema. pp. 54–64. ISBN 90-6191-859-6.
- ^ Paul Heineman (1975). Flore Illustrèe des champignons d’Afrique centrale 4: Volvariella. Meise, Belgium: National
Botanical Garden of Belgium.
{{cite book}}: line feed character in|publisher=at position 9 (help) - ^ Marco Contu (2006). "Volvariella earlei (Basidiomycota, Pluteaceae) nuova per l'Europa, e note sulla tassonomia di Volvariella media sensu J.Lange". Micologia i Vegetazione Mediterranea. 21 (29): 101–106.