Psilophyton

Psilophyton; Temporal range: Devonian
	Acid-prepared P. crenulatum, National Museum of Natural History
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Class:	†Trimerophytopsida
Order:	†Trimerophytales
Family:	†Trimerophytaceae
Genus:	†Psilophyton; Dawson (1859) emend. Hueber & H.P.Banks (1967)
Type species
	Psilophyton princeps; Dawson (1859)
Species
	P. burnotense (Gilkinet) Kräusel & Weyland ; P. charientos Gensel (1979) ; P. coniculum Trant & Gensel (1985) ; P. crenulatum Doran (1980) ; P. dapsile Kasper et al. (1974) ; P. dawsonii H.P.Banks et al. (1975) ; P. forbesii Andrews et al. (1968) ; P. genseliae Gerienne (1997) ; P. krauselii Obrhel (1959) ; P. microspinosum Kasper et al. (1974) ; P. parvulum Gerienne (1995) ; P. princeps Dawson (1859) ; P. primitivum Hao & Gensel (1998) ; P. szaferi Zdebska (1986) ;

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. Plants lacked leaves or true roots; spore-forming organs or sporangia were borne on the ends of branched clusters. It is significantly more complex than some other plants of comparable age (e.g. Rhynia) and is thought to be part of the group from within which the modern ferns and seed plants evolved.

Psilophyton Temporal range: Devonian

Acid-prepared P. crenulatum, National Museum of Natural History
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Class:	†Trimerophytopsida
Order:	†Trimerophytales
Family:	†Trimerophytaceae
Genus:	†Psilophyton Dawson (1859) emend. Hueber & H.P.Banks (1967)
Type species
Psilophyton princeps Dawson (1859)
Species
P. burnotense (Gilkinet) Kräusel & Weyland P. charientos Gensel (1979) P. coniculum Trant & Gensel (1985) P. crenulatum Doran (1980) P. dapsile Kasper et al. (1974) P. dawsonii H.P.Banks et al. (1975) P. forbesii Andrews et al. (1968) P. genseliae Gerienne (1997) P. krauselii Obrhel (1959) P. microspinosum Kasper et al. (1974) P. parvulum Gerienne (1995) P. princeps Dawson (1859) P. primitivum Hao & Gensel (1998) P. szaferi Zdebska (1986)