1) Tracheophyte 2) Vascular plant 
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 {period span/brief|Devonian|-1}). 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 tru...
(from the article `Dawson, Sir John William`) In 1859 he announced his discovery of the then-earliest-known land plant, Psilophyton, which he found in Devonian strata (dating from 408 to 360 ...
[n] - any plant or fossil of the genus Psilophyton
noun any plant or fossil of the genus Psilophyton