Psilotopsida
| Psilotopsida | |
|---|---|
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Scientific classification  |
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| Kingdom: | Plantae |
| Division: | Pteridophyta |
| Class: | Psilotopsida D. H. Scott |
| Orders & families | |
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Psilotopsida is a class of ferns or fern-like plants, considered to be one of the three classes of eusporangiate ferns.[1] It should not be confused with the obsolete class Psilophytopsida. As circumscribed by Smith et al., 2006,[2] Psilotopsida contains two families, Psilotaceae and Ophioglossaceae, placed in orders Psilotales and Ophioglossales, respectively.[3] The affinities of these two groups have long been unclear and a close relationship between them has only recently been confirmed through molecular systematic studies. Some studies show that Psilotopsida is the sister-group to all other ferns (including Marattiaceae and Equisetaceae),[1][4] but others indicate that Equisetaceae is more basal.[5]
References
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