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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 Middle Ordovician trilobite Illaenus †Illaenus †Kaulangiophyton †Kaulangiophyton akantha †Kolihadiscus †Kolihadiscus somerseti – type locality for species †Leptaena †Leptaena rhomboidalis †Lesueurilla – tentative report †Lophospira †Lophospira milleri – or unidentified comparable form †Mesoleptostrophia ...
The Trout Valley Formation also contains fossilized Psilophyton plants, as well as a number of other taxa, including Pertica quadrifaria, the official state fossil, [3] the tallest plant of its age known from anywhere in the world.
Psilophytites is a form genus of extinct plants; it was created by Høeg for spiny stems (axes) which cannot be assigned to a more precise genus or species, [3] usually because spore-forming organs or sporangia are not present.
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 ...
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.