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Psilophyton is a genus of extinct vascular plants. Described in 1859, it was one of the first fossil plants to be found which was of Devonian age (about 420 to 360 million years ago ). Specimens have been found in northern Maine , USA; Gaspé Bay , Quebec and New Brunswick , Canada; the Czech Republic ; and Yunnan , China.
The class was created in 1917 by Kidston and Lang for fossils found in the Rhynie Chert Bed. [4] Three genera were initially included, Rhynia, Horneophyton and Psilophyton. All lacked leaves and true roots, consisting only of branched stems; however they were considered to contain vascular tissue. [1] Additional fossil genera were added later.
Trimerophytopsida (or Trimeropsida) is a class of early vascular plants from the Devonian, informally called trimerophytes.It contains genera such as Psilophyton.This group is probably paraphyletic, and is believed to be the ancestral group from which both the ferns and seed plants evolved.
Fossil of the primitive Devonian vascular plant Psilophyton †Psilophyton †Pteria – report made of unidentified related form or using admittedly obsolete nomenclature †Ptychagnostus †Pugnax †Receptaculites †Rhynchonella †Rothpletzella † Sarcinula †Schwagerina †Sinutropis †Skenidioides †Solenopora †Solenopora compacta
Abadehella † Acanthocladia † Acanthopecten † Acanthopecten carbonifer – or unidentified related form † Acanthopecten delawarensis – or unidentified related form † Acanthophyllum Fossil of the Silurian-Middle Devonian trilobite Acanthopyge † Acanthopyge † Acervularia † Aclisina – tentative report † Acmarhachis † Acmarhachis acutus † Acrosaccus † Acrosaccus shuleri ...
Like some Psilophyton species, Aarabia had short side branches in which the last sections curved back on themselves. On the other hand, Aarabia had relatively few sporangia in each fertile branching unit and they were single, not paired, whereas most trimerophytes had large clusters of sporangia carried in pairs which were often twisted around ...
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The progymnosperms are an extinct group of woody, spore-bearing plants that is presumed to have evolved from the trimerophytes, and eventually gave rise to the gymnosperms, ancestral to acrogymnosperms and angiosperms (flowering plants). [1]