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Vascular plants (from Latin vasculum 'duct'), also called tracheophytes (UK: / ˈ t r æ k iː ə ˌ f aɪ t s /, [5] US: / ˈ t r eɪ k iː ə ˌ f aɪ t s /) [6] or collectively tracheophyta (/ ˌ t r eɪ k iː ˈ ɒ f ɪ t ə /; [7] [8] [9] from Ancient Greek τραχεῖα ἀρτηρία (trakheîa artēría) 'windpipe' and φυτά (phutá) 'plants'), [9] are plants that have lignified ...
Zosterophyllum was a genus of Silurian-Devonian vascular land plants with naked branching axes on which usually kidney-shaped sporangia were arranged in lateral positions. It is the type genus for the group known as zosterophylls, thought to be part of the lineage from which modern lycophytes evolved.
Synapomorphies of the family Lepidodendraceae are a bilaterally flattened megasporangium and infrafoliar parichnos which extend below the leaf scar. [33] The generic names Lepidodendron and Diaphorodendron today describe both cellularly preserved stem segments and entire plants, including their foliar organs, underground organs, and ...
The group was described as a subdivision of the division Tracheophyta by Harlan Parker Banks in 1968 under the name Rhyniophytina. The original definition was: "plants with naked (lacking emergences), dichotomizing axes bearing sporangia that are terminal, usually fusiform and may dehisce longitudinally; they are diminutive plants and, in so far as is known, have a small terete xylem strand ...
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 .
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Equisetum (/ ˌ ɛ k w ɪ ˈ s iː t əm /; horsetail) is the only living genus in Equisetaceae, a family of vascular plants that reproduce by spores rather than seeds. [2]Equisetum is a "living fossil", the only living genus of the entire subclass Equisetidae, which for over 100 million years was much more diverse and dominated the understorey of late Paleozoic forests.
Aglaophyton major. The stems of Aglaophyton were round in cross-section, smooth, unornamented, and up to about 6mm in diameter. Kidston and Lang [3] interpreted the plant as growing upright, to about 50 cm in height, but Edwards [1] has re-interpreted it as having prostrate habit, with shorter aerial axes of about 15 cm height.