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Cooksonia
| Cooksonia Temporal range:
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|---|---|
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| C. pertoni fossil (USNM 298794), National Museum of Natural History | |
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Stem group: | †Rhyniophytes |
| Form taxon: | †Cooksonioidea |
| Genus: | †Cooksonia Lang 1937 emend. Gonez & Gerrienne 2010[3] non Druce 1905 |
| Type species | |
| Cooksonia pertoni Lang 1937
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| Species | |
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Cooksonia is an extinct group of primitive land plants, treated as a genus, although probably not monophyletic. The earliest Cooksonia date from the middle of the Silurian (the Wenlock epoch);[1] the group continued to be an important component of the flora until the end of the Early Devonian, a total time span of 433 to 393 million years ago. While Cooksonia fossils are distributed globally, most type specimens come from Britain, where they were first discovered in 1937.[4] Cooksonia includes the oldest known plant to have a stem with vascular tissue and is thus a transitional form between the primitive non-vascular bryophytes and the vascular plants.[5]
- ^ a b Cite error: The named reference
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Lang1937was invoked but never defined (see the help page). - ^ Freeman, Scott; Herron, Jon C. (2004). Evolutionary analysis (3rd ed.). Upper Saddle River, NJ: Pearson Education. p. 816. ISBN 978-0-13-101859-4.
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