About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 36. Chapters: Psilophyton, Zosterophyllopsida, Cooksonia, Prototaxites, Ornatifilum, Tetraxylopteris, Horneophyton, Nothia, Archaeopteris, Rhynia, Aglaophyton, Nematothallus, Pteridospermatophyta, Distichophytum, Rhyniopsida, Pertica, Aberlemnia, Wenshania, Adoketophyton, Protosalvinia, Tortilicaulis, Danziella, Nematophyta, Trimerophytopsida, Spongiophyton, Discalis, Ventarura, Renalia, Chaetocladus, Huia, Cosmochlaina, Trichopherophyton, Hicklingia, Baragwanathia, Sartilmania, Asteroxylon, Drepanophycus, Progymnosperm, Horneophytopsida, Drepanophycaceae, Yunia, Stockmansella, Hsua, Wattieza, Dutoitea, Drepanophycus spinaeformis, Gumuia, Drepanophycales, Huvenia, Uskiella, Crenaticaulis, Catenalis, Zosterophyllum, Celatheca, Bracteophyton, Parka, Cladoxylopsid, Sciadophyton, Protobarinophyton, Serrulacaulis, Thrinkophyton, Deheubarthia, Anisophyton, Gosslingia, Konioria, Oricilla, Tarella, Eophyllophyton, Guangnania, Bitelaria, Krithodeophyton, Pachytheca, Eogaspesiea, Aarabia. Excerpt: 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 ). Specimens have been found in northern Maine, USA; Gaspe 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. Almost all the species of Psilophyton have been found in rocks of Emsian age (around ). One exception is P. krauselii, from the Czech Republic, which is younger, being from the upper part of the Middle Devonian (around ). Psilophyton dawsonii is the best-known speci...
