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Revision as of 08:11, 4 October 2005
- This is an article about the non-vascular plants. The name Hornwort is also often applied to the aquatic plant Ceratophyllum demersum in the family Ceratophyllaceae
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Hornworts (or horned liverworts) are a group of non-vascular plants comprising the class Anthocerotae. The common name refers to the elongated horn-like structure, which is the sporophyte, growing from an archegonium embedded deep in the gametophyte thallus. The green plant body of a hornwort is the gametophyte plant.
Hornworts possess a basal meristem and contain just one chloroplast per cell. Unlike other bryophytes, the hornworts have true stomata.
In this classification scheme, there are two orders of hornworts. Hornworts were traditionally considered a class within the Division Bryophyta, (bryophytes). However, it now appears that this group is paraphyletic, so they tend to be given their own division, called Anthocerotophyta. There is a single class, called Anthocerotopsida.
Families within Class Anthocerotopsida
- Anthocerotales
- Anthocerotaceae
- Dendrocerotaceae
- Nothothylales
- Notothyladaceae
External links
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