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The "grammitid ferns" form a clade of about 750 species within the Polypodiaceae.〔 They are distributed over higher elevations in both the Old and New World.〔 This group was previously treated as a separate family (Grammitidaceae), but because molecular phylogeny showed that it was nested within Polypodiaceae, it is now treated as an informal clade within that family. In 2011, Christenhusz ''et al.''〔 placed the grammitid ferns in the subfamily Polypodioideae, within the Polypodiaceae. The following phylogram shows a likely relationship between grammitid ferns and the Polypodiaceae subfamilies, based on Schuettpelz & Pryer, 2008.〔 |label2=Polypodioideae |2= }} }} }} ==Genera== The grammitid ferns include the following genera. All except the most recent were formerly included in the family Grammitidaceae. Note that many of these genera have been found to be polyphyletic, so near-term changes to this list are likely. 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「Grammitid」の詳細全文を読む スポンサード リンク
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