Iridopteridales is an order of the extinct cladoxylopsids. It contains the genus ''

Ibyka ''Ibyka'' is an extinct genus of Iridopteridales, and a possible ancestor to horsetails ''Equisetum'' (; horsetail, snake grass, puzzlegrass) is the only living genus in Equisetaceae, a family of ferns, which reproduce by spores rather t ...

'' which is a possible ancestor of the

horsetails ''Equisetum'' (; horsetail, snake grass, puzzlegrass) is the only living genus in Equisetaceae, a family of ferns, which reproduce by spores rather than seeds. ''Equisetum'' is a " living fossil", the only living genus of the entire subclass ...

.Thomas N. Taylor, Edith L. Taylor, Michael Krings: Paleobotany. The Biology and Evolution of Fossil Plants . Second Edition, Academic Press 2009, , p. 398-400.

References

Fern orders Prehistoric plant orders {{paleobotany-stub