Sphenophyllum

Sphenophyllum

▪ fossil plant genus
      genus of extinct plants (plant) that lived from the end of the Devonian Period to the beginning of the Triassic Period (about 360 to 251 million years ago); it is most commonly reconstructed as a shrub or a creeping vine. Sphenophyllum had a strong node-internode architecture, which has led some authorities to ally it with modern horsetails (horsetail). Branches and leaves were arranged in whorls at each node much like the later were triangular in shape (Calamites). spore-bearing cones (cone) were also similar to those of Calamites and modern horsetails; however, Sphenophyllum lacked the hollow central stem that characterizes horsetail relatives because its tracheids (tracheid), or water-conducting cells, were arranged in a central triangle surrounded by wood. Sphenophyllum grew in floodplain swamps, away from the margins of rivers.

Nan Crystal Arens
 

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  • Sphenophyllum — Brongn. (Keilblatt), fossile, vom Kulm bis an die obere Steinkohle vorkommende Pflanzengattung, die eine eigne, den Filicinen, Equisetinen und Lykopodinen gleichwertigen Abteilung der Gefäßkryptogamen mit der einzigen Familie der Sphenophyllazeen …   Meyers Großes Konversations-Lexikon

  • sphénophyllum — [sfenofilɔm] n. m. ÉTYM. 1875, sphénophylle, P. Larousse; du lat. bot.; → suff. phylle. ❖ ♦ Bot. Plante cryptogame vasculaire (Ptéridophytes), fossile, de la famille des Équisétinées, liane aux feuilles verticillées. || Par la structure de ses… …   Encyclopédie Universelle

  • Sphenophyllum — (Sphenophylhtes, S. Brongn., Keilblatt, Rotularia Sternb.), ausgestorbene Pflanzengattung der Equisetaceen; Arten: S. majus, S. Schlotheimii, S. emarginatum, aus dem Schieferthone von Wettin, Zwickau, Schlesien u. andern Orten …   Pierer's Universal-Lexikon

  • sphenophyllum — sphe·no·phyl·lum …   English syllables

  • sphenophyllum — ˌsfēnəˈfiləm noun Usage: capitalized Etymology: New Latin, from sphen + phyllum : a genus of Paleozoic fossil plants that are related to the club mosses and horsetails but are usually placed in the separate order Sphenophyllales, that have… …   Useful english dictionary

  • Roupala sphenophyllum — Saltar a navegación, búsqueda ? Roupala sphenophyllum Estado de conservación …   Wikipedia Español

  • Roupala sphenophyllum — taxobox status = VU status system = IUCN2.3 regnum = Plantae unranked divisio = Angiosperms unranked classis = Eudicots ordo = Proteales familia = Proteaceae genus = Roupala species = R. sphenophyllum binomial = Roupala sphenophyllum binomial… …   Wikipedia

  • ARTHROPHYTES — Les prêles (genre Equisetum ), communément appelées «queues de cheval», sont actuellement les seules représentantes des Articulées ou Arthrophytes qui forment l’un des rameaux du vaste ensemble des Cryptogames vasculaires ou Ptéridophytes. Les… …   Encyclopédie Universelle

  • Sphenophyllales — ? Sphenophyllales Fósil Fósiles: Devónico a Triásico Sphenophyllum …   Wikipedia Español

  • ИСКОПАЕМЫЕ РАСТЕНИЯ — растения геол. прошлого, остатки к рых сохранились в отложениях земной коры. Среди них встречаются как ныне живущие, так и целиком вымершие (риниофиты, прапапоротники, каламиты, птеридоспермы, кордаитовые, беннеттитовые, глоссоптериды и др.) И. р …   Биологический энциклопедический словарь

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