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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.
The first species of this genus (Sawdonia ornata) was described in 1859 by Sir J. William Dawson and, was originally attributed to the genus Psilophyton. He named this plant Psilophyton princeps. In 1971 Francis Hueber proposed a new genus for this species due to its "Divergent technical characters from the generic description for Psilophyton."
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
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 ...
After Gwynne-Vaughan's death in 1915 [4] he studied preserved plant remnants in Aberdeen, making great insights into the nature of Psilophyton, which until then had been neglected. [3] In 1900 he was awarded a Doctor of Science degree by the University of Glasgow, and when the Barker chair of cryptogamic botany was created at the University of ...
At first most of the fossilized early land plants other than bryophytes were placed in the class Psilophyta, established in 1917 by Kidston and Lang. [9] As additional fossils were discovered and described, it became apparent that the Psilophyta were not a homogeneous group of plants, and in 1975 Banks developed his earlier proposal to split it into three groups, which he put at the rank of ...