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''Polypodium'' is a genus of 75–100 species of true ferns, widely distributed throughout the world, with the highest species diversity in the tropics. The name is derived from Ancient Greek ''poly'' (πολύ) "many" + ''podion'' (πόδιον) "little foot", on account of the foot-like appearance of the rhizome and its branches. They are commonly called polypody or rockcap fern, but for many species unique vernacular names exist. They are terrestrial or epiphytic ferns, with a creeping, densely hairy or scaly rhizome bearing fronds at intervals along its length. The species differ in size and general appearance and in the character of the fronds, which are evergreen, persisting for 1-2 years, pinnate or pinnatifid (rarely simple entire), and from 10-80 cm or more long. The sori or groups of spore-cases (sporangia) are borne on the back of the frond; they are globose and naked, not covered with a membrane (indusium). Polypodies have some use in herbalism, but are today most important in horticulture where several species, hybrids, and their cultivars like ''Polypodium'' 'Green Wave' are commonly used as ornamental plants for shady locations. ''Polypodium'' have a bitter-sweet taste and are among the rather few ferns that are used in cooking; in this case as a spice e.g. for nougat. ==Selected species== Several of the species form hybrids with other species in the genus; these may often be distinguished by being sterile, with very small "blind" sori. * ''Polypodium abitaguae'' * ''Polypodium alfredii'' * ''Polypodium amorphum'' Suksdorf – irregular polypody * ''Polypodium appalachianum'' Haufler & Windham – Appalachian rockcap fern * ''Polypodium argyrolepis'' * ''Polypodium asterolepis'' Baker * ''Polypodium billardieri'' * ''Polypodium californicum'' Kaulf. * ''Polypodium calirhiza'' – nested polypody, habit polypody * ''Polypodium cambricum'' L. (= ''P. australe'' Fée) – southern polypody * ''Polypodium chionolepis'' * ''Polypodium decumanum'' – Calaguala fern * ''Polypodium excavatum'' Roxb. * ''Polypodium exiguum'' – hug-me-tight * ''Polypodium feei'' (Bory) Mett. * ''Polypodium × font-queri'' (''P. cambricum'' × ''P. vulgare'') * ''Polypodium formosanum'' Baker - grub fern * ''Polypodium furfuraceum'' Schltdl. & Cham. * ''Polypodium glycyrrhiza'' D.C.Eaton – licorice fern * ''Polypodium hesperium'' Maxon – western polypody * ''Polypodium incanum'' * ''Polypodium × incognitum'' * ''Polypodium interjectum'' Shivas – intermediate polypody * ''Polypodium latissimum'' * ''Polypodium lepidopteris'' (Langsd. & Fisch.) Kunze * ''Polypodium macaronesicum'' Bobrov * ''Polypodium × mantoniae'' (''P. interjectum'' × ''P. vulgare'') * ''Polypodium mindense'' * ''Polypodium mixtum'' * ''Polypodium nigrescens'' Blume * ''Polypodium nipponicum'' – ''aonekazura' (Japanese) * ''Polypodium percussum'' * ''Polypodium phymatodes'' L. * ''Polypodium piligerum'' * ''Polypodium punctatum'' Thunb. ex Murray * ''Polypodium pustulatum'' * ''Polypodium pycnocarpum'' C.Chr. * ''Polypodium quitense'' * ''Polypodium rimbachii'' * ''Polypodium × rothmaleri'' (''P. cambricum'' × ''P. interjectum'') * ''Polypodium saximontanum'' Windham * ''Polypodium scouleri'' Hooker & Greville – coast polypody * ''Polypodium scutulatum'' * ''Polypodium segregatum'' * ''Polypodium × shivasiae'' Rothm. (''P. cambricum'' × ''P. interjectum'') * ''Polypodium sibiricum'' Sipliv. – Siberian polypody * ''Polypodium triseriale'' Swartz * ''Polypodium virginianum'' L. – rock polypody * ''Polypodium vulgare'' – common polypody * ''Polypodium xalapense'' A number of species formerly included in the genus have recently been transferred to other genera, including ''Campyloneurum'', ''Cyathea'', ''Drynaria'', ''Microgramma'', ''Nephrolepis'', ''Neurodium'', ''Pecluma'', ''Phlebodium'', and ''Pleopeltis''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Polypodium」の詳細全文を読む スポンサード リンク
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