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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 Bracteophyton ： ウィキペディア英語版 Bracteophyton ''Bracteophyton'' is a genus of extinct vascular plants of the Early Devonian (around ). Fossils were first found in the Xujiachong Formation of eastern Yunnan, China. The smooth stems (axes) mainly branched dichotomously. They bore terminal 'spikes' (strobili) consisting of spirally arranged fertile 'units'. Each unit was made up of one or two bracts and a spore-forming organ (sporangium) between a bract and the stem. It appears that the sporangium released its spores by splitting along top. The arrangement of the sporangia resembles that of some zosterophylls, but the plant's discoverers consider its relationships uncertain at present.〔 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.