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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Cystopteris protrusa ： ウィキペディア英語版 Cystopteris protrusa ''Cystopteris protrusa'' is a common fern of eastern North America. Throughout much of its range, it is the most common ''Cystopteris''. It is commonly known as the lowland brittle fern or lowland fragile fern. The specific name, protrusa, refers to the fact that the rhizome protrudes a short distance beyond the current year's fronds to form the following year's leaf buds. This protrusion is a positive diagnostic in the field. Sori are round and covered in a bladder-like indusium. Unlike most species of this genus, this fern is exclusively terrestrial, often forming large, dense colonies. It is also largely a spring ephemeral. Some fronds may remain by late summer, but most have disappeared. ''C. protrusa'' was originally considered only a variety of ''Cystopteris fragilis''. However, it is now known that this is a diploid species, while ''C. fragilis'' (ss) is a polyploid species of hybrid origin. ''C. protrusa'' is a parent of the hybrid species ''Cystopteris tennesseensis'' and ''Cystopteris tenuis''. Also see Cystopteris hybrid complex. 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「Cystopteris protrusa」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.