翻訳と辞書 Words near each other ・ Rota Onorio ・ Rota Romântica ・ Rota system ・ Rota Vector ・ Rota Waitoa ・ Rota white-eye ・ Rota's basis conjecture ・ Rota's conjecture ・ Rota, Cádiz ・ Rotach ・ Rotach (Oberschwaben) ・ Rotadiscus ・ Rotae Passionis ・ Rotafix ・ Rotafolia ・ Rotafolia songziensis ・ Rotaka ・ Rotala ・ Rotala (plant) ・ Rotala indica ・ Rotala ramosior ・ Rotala rotundifolia ・ Rotaldo ・ Rotaliacea ・ Rotaliana ・ Rotaliata ・ Rotalidia ・ Rotalier ・ Rotaliida ・ Rotamah Island 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 Rotafolia songziensis ： ウィキペディア英語版 Rotafolia songziensis ''Rotafolia songziensis'' is a species of the extinct Sphenophyllales horsetails.〔Thomas N. Taylor, Edith L. Taylor, Michael Krings: Paleobotany. The Biology and Evolution of Fossil Plants . Second Edition, Academic Press 2009, ISBN 978-0-12-373972-8 , p. 333〕 ==Description== This plant is similar to ''Hamatophyton verticillatum'' and is found in the Xiejingsi Formation. ''R. songziensis'' consists of branched axes, up to 20 cm long, which have slightly swollen nodes and internodes with ribs and narrow branches produced from the nodes. The axes are protostelic. Cross sections show a roughly triangular or quadrangular organization of the primary xylem and radial arrangement of the secondary xylem. Primary xylem is exarch upon maturation, with protoxylem strands positioned around the tips of the primary xylem arms. No differentiation between fascicular and interfascicular regions of the secondary xylem is apparent, and ray cells are rarely observed. Protoxylem tracheids have helical wall thickenings, whereas the tracheids of meta- and secondary xylem possess scalariform and/or bordered pits. All ''R. songziensis'' axes bear trichomes or spines, some up to 2.8 mm long. At the nodes are whorls of six leaves, up to 2.4 cm long, that regularly or irregularly fork two to four times. The leaves are positioned perpendicular to the axis in proximal portions of the plant but insered at acute angles in distal portions. Fertile branches are produced in a terminal strobilus (8.5 cm long), which is subtended by whorls of normally developed leaves. It consists of a central axis and up to 16 whorls of fertile units, each of which consists of a bract and 6-10 sporangia. The bracts are elongate-cuneate and have prominent marginal fringes; sporangia are attached to the abaxial surface at the base of each brac. Although ''R. songziensis'' closely resembles ''H. verticillatum'' with its external axis morphology, leaf shape, and structure of the primary xylem. However, the two forms differ in strobilus morphology. 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「Rotafolia songziensis」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.