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''Thelypteris'' (maiden ferns) is a genus of ferns in the family Thelypteridaceae, order Polypodiales.〔 If the genus is defined fairly broadly, it contains 875〔(【引用サイトリンク】 Thelypteris )〕 species, many of which are extremely similar to one another, and is found nearly worldwide.〔 The ferns are terrestrial, with the exception of a few which are lithophytes (grow on rocks).〔 The bulk of the species are tropical, although there are a number of temperate species.〔 The genus name is from Greek ''thēlys'' "female" and ''pteris'' "fern". However, "female fern" usually refers to the common lady-fern. == Classification == At one time, all thelypterioid ferns were included in the genus Dryopteris because of the sorus shape. However, there are a great many differences between the groups, and these plants are now segregated in their own family. Some researchers include the entire family Thelypteridaceae in the genus ''Thelypteris''; others divide the family into as many as 30 genera. An intermediate position is to place the bulk in ''Thelypteris'' (which can then be divided into subgenera and sections corresponding to the genera of other authors) but to separate out ''Phegopteris'' and ''Macrothelypteris''.〔 Another choice is to divide the family into a half a dozen or so genera, one of which is ''Thelypteris''.〔 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「Thelypteris」の詳細全文を読む スポンサード リンク
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