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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 Drepanophycaceae ： ウィキペディア英語版 Drepanophycaceae Drepanophycaceae is a family of extinct vascular plants of the division Lycopodiophyta〔http://www.scientific-web.com/en/Biology/Plants/Lycopodiophyta/Drepanophycaceae.html〕 of Late Silurian to Late Devonian age (), found in North America, China, Russia, Europe, and Australia. ==Description== The stems are several mm to several cm in diameter and several cm to several metres long, erect or arched, dichotomizing occasionally, furnished with true roots at the base.〔Hueber 1992, p. 491 (''Baragwanathia'') and 492 (''Drepanophycus'')〕 Vascular bundle an exarch actinostele, tracheids of primitive annular or helical type (so-called G-type). Leaves are unbranched microphylls several mm to 2 cm or more long with a single prominent vascular thread, arranged spirally to randomly on the stem. Homosporous sporangia borne singly on the upper leaf surface or in an axillary position.〔See tables 2 & 3 in Gensel(1992) for list of these anatomical details〕 Differs from a related family of the same period, Asteroxylaceae, in having vascularized microphylls;〔ditto〕 see Drepanophycales for more details. 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「Drepanophycaceae」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.