Blechnaceae

Blechnaceae

▪ plant family
 the chain fern family, containing 9 genera and some 200 species, in the division Pteridophyta (the lower vascular plants (plant)). The family occurs nearly around the world but is most diverse in tropical regions of the Southern Hemisphere. Nearly all of the species are terrestrial or grow on rocks. Some species of Blechnum and Sadleria develop short, stout, trunklike stems and stiff, leathery leaves, which give them the appearance more of a cycad than a typical fern. Leaf morphology is extremely variable, ranging from pinnately lobed to several times pinnately compound, and the vegetative and fertile leaves are dimorphic in some genera. The sori (fern) vary from bean-shaped to linear and in most genera are positioned along both sides of the midrib of the leaflets or leaf divisions. Occasionally, they appear to cover the entire surface of the underside of fertile leaves. Often they are covered with a membranous protective flap of tissue (indusium (fern)), which is attached laterally along the inner side of the sorus. The spores are mostly bean-shaped (bilateral). A number of species of Blechnum (deer fern), Doodia (hacksaw fern), and Woodwardia (chain fern) are cultivated as ornamentals in gardens, greenhouses, conservatories, and homes.

George Yatskievych
 

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Universalium. 2010.

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Look at other dictionaries:

  • Blechnaceae — Saltar a navegación, búsqueda ? Blechnáceas Clasificación …   Wikipedia Español

  • Blechnaceae — Blechnacées …   Wikipédia en Français

  • Blechnaceae — Blechnacées …   Wikipédia en Français

  • Blechnaceae — Taxobox name = Blechnaceae image width = 240px image caption = Blechnum spicant regnum = Plantae divisio = Pteridophyta classis = Pteridopsida ordo = Athyriales familia = Blechnaceae familia authority = (C. Presl) Copel. subdivision ranks =… …   Wikipedia

  • Blechnaceae — Rippenfarngewächse Rippenfarn (Blechnum spicant) Systematik Reich: Pflanzen (Plantae) …   Deutsch Wikipedia

  • Blechnaceae — noun one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems; includes genera Blechnum, Doodia, Sadleria, Stenochlaena, and Woodwardia • Syn: ↑family Blechnaceae • Hypernyms: ↑fern family …   Useful english dictionary

  • family Blechnaceae — noun one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems; includes genera Blechnum, Doodia, Sadleria, Stenochlaena, and Woodwardia • Syn: ↑Blechnaceae • Hypernyms: ↑fern family •… …   Useful english dictionary

  • Blechnacée — Blechnaceae Blechnacées …   Wikipédia en Français

  • Роды сосудистых споровых — Приложение к статье Сосудистые споровые …   Википедия

  • Woodwardia — Temporal range: 15.6–0 Ma …   Wikipedia

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