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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.
Psilotum is a genus of fern-like vascular plants.It is one of two genera in the family Psilotaceae commonly known as whisk ferns, the other being Tmesipteris.Plants in these two genera were once thought to be descended from the earliest surviving vascular plants, but more recent phylogenies place them as basal ferns, as a sister group to Ophioglossales.
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.
Fossils of the Ordovician-Silurian trilobite Ampyx. †Ampyx †Annamitella – tentative report †Annamitella borealis †Apiculiretusispora †Atrypa †Atrypa reticularis †Barinophyton †Barinophyton richardsoni †Barrandeina †Barrandeina aroostookensis †Batostoma †Batostomella †Bucania – or unidentified comparable form ...
Fossil of the primitive Devonian vascular plant Psilophyton †Psilophyton †Psilophyton grandis †Pteracontiodus †Pteracontiodus bransoni †Pterina †Pterina demissa †Pterinea †Pterinea emacerata †Pterinea insueta †Pterinea jordani – or unidentified comparable form †Pterinea waylandsmithi – type locality for species ...
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
The fossils were better-preserved than Dawson's, and showed clearly that these early land plants did indeed consist of generally naked vertical stems arising from similar horizontal structures. The vertical stems were dichotomously branched with some branches ending in sporangia.