Lepidodendron


Lepidodendron

▪ fossil plant genus
 extinct genus of tree-sized lycopsid plants (plant) that lived during the Carboniferous Period (360 to 300 million years ago). Lepidodendron and its relatives—Lepidophloios, Bothrodendron, and Paralycopodites—were related to modern club mosses (club moss). They grew up to 40 metres (130 feet) in height and 2 metres (about 7 feet) in diameter. During their juvenile stages, these plants grew as unbranched trunks with a shock of long, thin leaves (leaf) that sprouted near the growing tip. They branched at later stages, either in even dichotomies at the growing tip or in lateral branches that were later shed. After branching, the leaves became shorter and awl-shaped. As the plant grew, it shed leaves from older parts of the stem that left diamond-shaped leaf bases. Stems were characterized by a slender central strand of wood and a thick bark. Since Stigmaria—the underground parts of the plant—resembled stems, they are not considered true roots (root). The shape of leaf bases and the arrangement of their vascular strands distinguish the different genera within the group of arborescent lycopsids.

      Lepidodendron and its relatives reproduced by spores (spore), with megaspores giving rise to the female (egg-producing) gametophyte and microspores giving rise to the male (sperm-producing) gametophyte. Lepidophloios wrapped its megasporangium in a layer of tissue much like that of the seed plants. This feature, however, was independently derived in the lycopsid lineage. In some genera, spore-bearing cones (cone) were produced at the tips of branches, suggesting that the plants could reproduce only once in their lifetime. Lepidodendron and its relatives lived in the extensive peat-forming swamps of the Early and Middle Pennsylvanian epochs (Pennsylvanian Subperiod) (318 to 306 million years ago) and became extinct when these swamps disappeared.

Nan Crystal Arens
 

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Universalium. 2010.

Look at other dictionaries:

  • Lepidodendron — Lepidodendron …   Wikipédia en Français

  • Lépidodendron — Lepidodendron Lepidodendron …   Wikipédia en Français

  • lepidodendron — LEPIDODÉNDRON, lepidodendroni, s.m. Arbore fosil din grupul criptogamelor vasculare, cu coroana în formă de umbrelă, ale cărui resturi s au păstrat în straturile de huilă. – Din fr. lépidodendron. Trimis de LauraGellner, 19.05.2004. Sursa: DEX 98 …   Dicționar Român

  • lépidodendron — [ lepidɔdɛ̃drɔ̃ ] n. m. • 1828; de lépido et gr. dendron « arbre » ♦ Paléont. Grand lycopode fossile arborescent de l ère primaire. ● lépidodendron nom masculin Grand arbre de l ère primaire, à ramification dichotomique et à frondaison en parasol …   Encyclopédie Universelle

  • lepidodèndrōn — m 〈G lepidodendróna〉 bot. fosilna crvotočina (Lepidodendron) iz doba karbona …   Veliki rječnik hrvatskoga jezika

  • lepidodendron — lepidodèndrōn m <G lepidodendróna> DEFINICIJA bot. fosilna crvotočina (Lepidodendron) iz doba karbona ETIMOLOGIJA grč. lepís: ljuska + déndron: drvo …   Hrvatski jezični portal

  • Lepidodendron — Lep i*do*den dron ( dr[o^]n), n. [NL., fr. Gr. lepi s i dos, a scale + de ndron tree.] (Paleon.) A genus of fossil trees of the Devonian and Carboniferous ages, having the exterior marked with scars, mostly in quincunx order, produced by the… …   The Collaborative International Dictionary of English

  • Lepidodendron — (L. Sternb.), baumartige Bärlappe aus der Familie der Lepidodendreae, erscheinen als baumartige, cylindrische, gabelig verzweigte Stämme, deren Oberfläche mit rhombischen od. lanzettlichen Narben dicht bedeckt, die eine regelmäßige quincunciale… …   Pierer's Universal-Lexikon

  • Lepidodéndron — Brgt., Schuppenbaum, einige fossile Gefäßkryptogamen der Lykopodiazeen, bes. in der Steinkohlenperiode verbreitet …   Kleines Konversations-Lexikon

  • Lepidodendron — o árbol de escamas por la forma de su tronco, es uno de los fósiles del período carbonífero (hace 360 a 286 millones de años) es la más común de las plantas encontradas en rocas del Pensilvánico, de un tamaño próximo a los 40 metros …   Enciclopedia Universal

  • Lepidodendron — Taxobox image caption = The cone of Lepidodendron fossil range = Carboniferous regnum = Plantae divisio = Lycopodiophyta classis = Isoetopsida ordo = Lepidodendrales familia = Lepidodendraceae genus = Lepidodendron subdivision ranks = Species… …   Wikipedia


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