The cladoxylopsids are a group of plants known only as fossils that are thought to be ancestors of ferns and horsetails. Artists illustration of a Devonian scene. ... Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. ... For other uses, see Plant (disambiguation). ... Classes Marattiopsida Osmundopsida Gleicheniopsida Pteridopsida A fern, or pteridophyte, is any one of a group of some twenty thousand species of plants classified in the Division Pteridophyta, formerly known as Filicophyta. ... For other uses, see Plant (disambiguation). ... For other uses, see Fossil (disambiguation). ... Classes Psilotopsida Equisetopsida Marattiopsida Pteridopsida (Polypodiopsida) this dnt make sense A fern is any one of a group of about 20,000 species of plants classified in the phylum or division Pteridophyta, also known as Filicophyta. ... Species The horsetails are vascular plants, comprising 15 species of plants in the genus Equisetum. ...

They had a central trunk, from the top of which several lateral branches were attached. Fossils of these plants originate in the Devonian and Carboniferous periods, mostly just as stems. Artists illustration of a Devonian scene. ... The Carboniferous is a major division of the geologic timescale that extends from the end of the Devonian period, about 359. ...

Taxonomy is still uncertain, the major taxon being Cladoxylopsida which includes two orders, Cladoxylales and Hyeniales

Intact fossils of the Middle Devonian cladoxylopsid Wattieza show it to have been a tree, the earliest identified in the fossil record as of 2007. In the geological timescale, the Middle Devonian epoch (from 397. ... Wattieza was a group of extinct, prehistoric fern-like plants. ...

References

• UC Museum of Palentology

• Stein, W. E., F. Mannolini, L. V. Hernick, E. Landling, and C. M. Berry. 2007. Giant cladoxylopsid trees resolve the enigma of the Earth's earliest forest stumps at Gilboa. Nature, 446:904-907.