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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 Ptisana purpurascens ： ウィキペディア英語版 Ptisana purpurascens ''Ptisana purpurascens'' is a large fern belonging to the botanical family Marattiaceae. It has a globular rhizome with stipule-like fleshy outgrowths. The leaves are dark green, twice pinnate and up to 1 metre long. Every pinnule has up to six pairs of leaflets. The petioles are dark-purplish, hence the name 'purpurascens' meaning 'becoming purple'. The sporangia are fused in all ''Ptisana'' into a bivalvate synangium. Conservation plans have been proposed for ''Ptisana purpurascens'', an endemic of the distant Ascension Island in the South Atlantic, where a single population remains on Green Mountain. While the mature plants are still present in large numbers, long-term threats to its survival exist in the form of competition with alien invasive species like introduced plants such as ''Buddleja madagascariensis'' and grazing by sheep and rabbits. Successful reproduction is very rare, making the species highly endangered. ==See also== *''Ptisana salicina'', a related plant from New Zealand. *''Danaea kalevala'', a related plant from the Caribbean. 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「Ptisana purpurascens」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.