Psilophyta

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Psilophyta

a division of extinct higher plants the remains of which have been traced to the Silurian and Lower and Middle Devonian periods. The Psilophyta had dichotomously branching stems. Leaves and roots were absent, and sporangia were borne on the ends of the shoots. The stem had a thin central cylinder (stele) with protoxylem in the center, and it was covered with a stomatous epidermis. The plants were marked by homospory. The Psilophyta are regarded as the primitive group that gave rise to higher cormophytic plants.

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No references found			Pseudovector pseudovector coupling pseudovector meson pseudovitrinite pseudovitrinoid pseudovolcano psf Pshart Pshav Pshenitsyn, Nikolai Pshenitsyn, Nikolai Konstantinovich Pshish psi psi function psi particle psi-prime particle psia psid psig PSII Psilander, Valdemar Einar psilate Psilidae psilocybin Psilomelane Psilophyta Psilophytales Psilophytineae Psilopsida Psilorhynchidae psilosis Psilotales Psilotatae Psilotophyta Psion Psion Organiser Psithyrus Psittacidae Psittaciformes psittacinite Psittacosaurus psittacosis psj PSK Pskem Pskent Pskov Pskov Bald-Headed Goose Pskov Chronicles Pskov Defense of 1581–82 Pskov Feudal Republic			Psila rosae Psilander, Valdemar Einar Psilanthropic Psilanthropism Psilanthropist Psilanthropy psilate Psili pneumata Psilidae Psilocaulon psilocin psilocin Psilocine Psilocine Psilocybe Psilocybe mushrooms Psilocybes psilocybin psilocybin psilocybin Psilocybin mushrooms Psilocybine Psilocybine Psilocybine Psilology psilomelane psilomelane Psilon pneuma Psilopaedes Psilopaedic Psilophyta Psilophytaceae Psilophytales Psilophytales psilophyte Psilophytineae psilophyton Psilopsida Psilopsida Psilorhynchidae psilosis psilosis psilosis Psilosopher psilostomatid Psilostrophe Psilostrophe Tagetina Psilotaceae Psilotales Psilotales Psilotatae Psilotatae Psilotophyta Psilotophyta Psilotophyte Psilotophyte Psilotsin Psilotsin Psilotum Psilotum nudum PSILPH

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