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Blechnum
''Blechnum'' (hard fern) is a genus of between 150–220 species of ferns with a cosmopolitan distribution, in the family Blechnaceae in the eupolypods II clade of the order Polypodiales.〔 By far the greatest species diversity is in tropical regions of the Southern Hemisphere, with only a few species reaching cool temperate latitudes in the Southern Hemisphere (notably ''B. penna-marina'', south to Cape Horn, Chile, the southernmost fern in the world) and Northern Hemisphere (notably ''B. spicant'', north to Iceland and northern Norway).
Most are herbaceous plants, but a few species (e.g. ''B. buchtienii'' and ''B. schomburgkii'' in Ecuador) are tree ferns with stems up to 3 m tall. ''Blechnum'' varies from most ferns in having a separation of sterile (photosynthetic) and fertile (reproductive) fronds in the same plant.
==Species==
;Selected species
*''Blechnum arcuatum''
*''Blechnum ambiguum'' (C.Presl) Kaulf. ex C.Chr.
*''Blechnum blechnoides''
*''Blechnum brasiliense'' Desv.
*''Blechnum buchtienii'' Rosenst.
*''Blechnum cartilagineum'' Sw.
*''Blechnum chambersii''
*''Blechnum chilense'' Kaulf.
*''Blechnum contiguum''
*
*''Blechnum cordatum'' (Desv.) Hieron. (syn. ''B. chilense'')
*''Blechnum cycadifolium'' (Colla) Sturm.
*''Blechnum dendrophilum''
*''Blechnum discolor''
*''Blechnum durum''
*''Blechnum eburneum''
*''Blechnum filiforme''
*''Blechnum fluviatile''
*''Blechnum fullagarii''
*''Blechnum geniculatum''
*''Blechnum gibbum''
*''Blechnum gracile'' Kaulf.
*''Blechnum howeanum''
*''Blechnum indicum'' Burm.f.
*''Blechnum lanceola'' Sw.
*''Blechnum magellanicum''
*''Blechnum membranaceum'' (Col.) Mett.
*''Blechnum minus''
*''Blechnum monomorphum''
*''Blechnum nigrum''
*''Blechnum nipponicum'' (Kunze) Makino
*''Blechnum novae-zelandiae'' T.C.Chambers & P.A.Farrant
*''Blechnum nudum'' (Labill.) Mett. ex Luerss.
*''Blechnum obtusatum'' (Labill.) Mett.
*''Blechnum occidentale'' L.
*''Blechnum orientale'' L.
*''Blechnum palmiforme'' (Thouars) C.Chr. in Christoph.
*''Blechnum patersonii''
*''Blechnum penna-marina'' (Poir.) Kuhn
*''Blechnum petiolare''
*''Blechnum procerum'' T.C.Chambers & P.A.Farrant
*''Blechnum schomburgkii'' (Klotzsch) C.Chr.
*''Blechnum serrulatum'' Rich.
*''Blechnum spicant'' (L.) Sm.
*''Blechnum socialis''
*''Blechnum tabulare''
*''Blechnum vittatum'' Brack.
*''Blechnum volubile'' Kaulf.
*''Blechnum wattsii'', Tindale Hard Water Fern
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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