Leptosporangiate fern
- Leptosporangiate fern
Leptosporangiate ferns are vascular spore plants, whose
sporangia arose from a single epidermal cell and not from a group of cells as ineusporangiate fern s. The sporangia are typically covered with a scale (from Greek: 'lepis', 'lepidos') called theindusium , which can cover the wholesorus , but can also be strongly reduced. Many leptosporangiate ferns have anannulus around the sporanium, which ejects the spores.Most extant fern families are leptosporangiates. Examples are:
Dryopteridaceae ,Cyatheaceae ,Polypodiaceae ,Athyriaceae ,Woodsiaceae ,Onocleaceae ,Lomariopsidaceae andTectariaceae .References:
Smith, A. R., Pryer, K. M., Schuettpelz, E., Korall, P., Schneider, H., Wolf, P. 2006. A classification for extant ferns. "Taxon" 55(3): 705-731.
Sporne, K. R. 1962. The morphology of pteridophytes, the structure of ferns and allied plants. pp. 127-135. Hutchison & Co. London.
Wikimedia Foundation. 2010.
Look at other dictionaries:
Fern — Taxobox name = Ferns (Pteridophyta) fossil range = Mid Devonian [ Wattieza , Stein, W. E., F. Mannolini, L. V. Hernick, E. Landling, and C. M. Berry. 2007. [http://www.nature.com/nature/journal/v446/n7138/abs/nature05705.html Giant cladoxylopsid… … Wikipedia
Eusporangiate fern — Eusporangiate ferns are vascular spore plants, whose sporangia arose from several epidermal cells and not from a single cell as in leptosporangiate ferns. Typically these ferns have reduced root systems and sporangia that produce large amounts or … Wikipedia
lower vascular plant — ▪ biology Introduction formerly pteridophyte, also called vascular cryptogam, any of the spore bearing vascular plants, including the ferns, club mosses, spike mosses, quillworts, horsetails, and whisk ferns. Once considered of the… … Universalium
Pteridopsida — Taxobox name = Pteridopsida Modern Ferns image width = 240px image caption = Tree fern regnum = Plantae divisio = Pteridophyta classis = Pteridopsida/Polypodiopsida subdivision ranks = Orders subdivision = * Osmundales * Hymenophyllales *… … Wikipedia
Monilophyte — Taxobox name = Monilophytes regnum = Plantae divisio = Pteridophyta subdivision ranks = Classes subdivision = * Psilotopsida * Equisetopsida * Marattiopsida * PolypodiopsidaMonilophyte refers to the monophyletic group of ferns, defined in a broad … Wikipedia
Psilotopsida — Taxobox name = Psilotopsida regnum = Plantae divisio = Pteridophyta classis = Psilotopsida classis authority = D. H. Scott subdivision ranks = Orders subdivision = *Ophioglossales *PsilotalesPsilotopsida is a class of fern like plants.cite… … Wikipedia
