翻訳と辞書 Words near each other ・ Demerara Falls tree frog ・ Demerara Harbour Bridge ・ Demerara rebellion of 1823 ・ Demerara River ・ Demerara-Essequibo ・ Demerara-Mahaica ・ Demerath ・ Demere Key ・ Demerger ・ Demerit ・ Demerit good ・ Demerje ・ Demers ・ Demersal fish ・ Demersal zone ・ Demersatheca ・ Demerson ・ Demerval Lobão ・ Demese Tsege ・ Demesmaekerite ・ Demesne ・ Demesvar Delorme ・ Demet ・ Demet (magazine) ・ Demet Akalın ・ Demet Akbağ ・ Demet Evgar ・ Demet Kılınç ・ Demet Müftüoğlu ・ Demet Sağıroğlu Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Demersatheca ： ウィキペディア英語版 Demersatheca ''Demersatheca'' is a genus of extinct vascular plants of the Early Devonian (Pragian, around ). Fossils were first found in the Posongchong Formation of eastern Yunnan, China. The plant had smooth leafless stems at least 1 mm in diameter, but only regions which bore spore-forming organs or sporangia are well-known. Sporangia were borne in 'spikes' or strobili, at least 40 mm long; one had 32 sporangia. Sporangia were arranged in four rows, two sporangia being opposite to one another on the stem with the next two being at right angles. Each sporangium consisted of two 'valves' which opened at the top to release their spores. A particular feature of ''Demersatheca'' which distinguishes it from other zosterophylls is that the stalk-less sporangia were sunken into the stem of the spike, so that the outer valve was flush with the surface.〔 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「Demersatheca」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.