翻訳と辞書 Words near each other ・ Metzgau ・ Metzger ・ Metzger House ・ Metzger, Oregon ・ Metzgerbach ・ Metzgeria ・ Metzgeria (gastropod) ・ Metzgeria alba ・ Metzgeria californica ・ Metzgeria costata ・ Metzgeria furcata ・ Metzgeria gagei ・ Metzgeria montereyana ・ Metzgeria problematica ・ Metzgeriaceae ・ Metzgeriales ・ Metzgeriites ・ Metzgeriothallus ・ Metzia ・ Metzing ・ Metzingen ・ Metzinger ・ Metzitzim ・ Metzler ・ Metzler Bank ・ Metzler matrix ・ Metzler Orgelbau ・ Metzler paradox ・ Metzler Visiting Professorship ・ Metzner 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 Metzgeriales ： ウィキペディア英語版 Metzgeriales Metzgeriales is an order of liverworts. The group is sometimes called the simple thalloid liverworts: "thalloid" because the members lack structures resembling stems or leaves, and "simple" because their tissues are thin and relatively undifferentiated. All species in the order have a small gametophyte stage and a smaller, relatively short-lived, spore-bearing stage. Although these plants are almost entirely restricted to regions with high humidity or readily available moisture, the group as a whole is widely distributed, and occurs on every continent except Antarctica. == Description == Members of the Metzgeriales typically are small and thin enough to be translucent, with most of the tissues only a single cell layer in thickness. Because these plants are thin and relatively undifferentiated, with little evidence of distinct tissues, the Metzgeriales are sometimes called the "simple thalloid liverworts". There is considerable diversity in vegetative structure of the Metzgeriales. As a rule, simple thalloid liverworts do not have structures resembling leaves. However, a few genera, such as ''Fossombronia'', and ''Symphyogyna'', are "semileafy" and have a thallus that is very deeply lobed, thus giving the appearance of leafiness. The genus ''Phyllothallia'' has a more striking leafiness, with paired lobes of tissue spaced regularly at swollen nodes along a central, forked stem. The several semileafy groups within the Metzgeriales are not closely related to each other, and the currently accepted view is that the leafy condition evolved separately and independently in each of the groups where it occurs.〔 Members of the Metzgeriales also differ from the related Jungermanniales in the location of their archegonia (female reproductive structures). Whereas archegonia in the Jungermanniales develop directly from the apical cell at the tip of a fertile branch, archegonia in the Metzgeriales develop from a cell that is behind the apical cell. As a result, the female reproductive organs, and the sporophytes that develop within them, are always located on the dorsal surface of the plant. Because these structures do not develop at the apex of the branch, their development in the Metzgeriales is described as ''anacrogynous'', from Greek ἀν- (''an-'', "not") + ἄκρος (''akros'', "tip") + γυνή (''gynē'', “female”). The group was accordingly known as the Anacrogynae prior to being recognized as a separate order. 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「Metzgeriales」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.