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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 Pilularia americana ： ウィキペディア英語版 Pilularia americana The American pillwort, ''Pilularia americana'' A. Braun is an unusual species of fern. The fronds essentially consist of the stems only, any form of flattened laminae having been lost. It is in the aquatic fern family Marsileaceae, and is related to the water clovers and also to ''Azolla'' and ''Salvinia''. ==Description== The pillwort, along with all other aquatic ferns in the order Salviniales, exhibits heterospory and forms hard, seed-like sporocarps, as do the other members of the order. The sporocarps are distinctly different from the closely related genus ''Marsilea'' because they are globose in ''Pilularia'', while they are flattened in ''Marsilea''. The ferns in the ''Pilularia'' genus also have lost their leaf blades, with only the grass-like stipe remaining. However, this plant retains the circinate vernation characteristic of most ferns. 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「Pilularia americana」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.