| 翻訳と辞書 |
| Phaeoceros laevis ： ウィキペディア英語版 |
Phaeoceros laevis
''Phaeoceros laevis'' is a species of hornwort of the genus ''Phaeoceros''. It is commonly found in areas where moisture is plentiful, such as moist soils in fields, the banks of streams and rivers or inundated beneath the surface of the rivers. It grows to a maximum height of about 5 millimetres and the plants are monoecious; the sex organs are visible on the dorsal surface.〔
The thallus is nearly flat on the upper surface. It is of dark green and somewhat lustrous color, devoid of intercellular spaces. Its capsule is commonly to in length. The base is surrounded by a cylindrical sheath that often flares at the mouth. Spores are yellow with a granular-papillose surface. The elaters are yellowish, often branches, and varying in size and form. The slender green capsules, when produced in large numbers, resemble grass tufts. Mature spores are necessary for species determination.
The cytology of ''P. laevis'' has been subject to considerable study. In 1909, Lotsy reported that the plant contained one chloroplast in each cell of the gametophyte and two in each cell of the sporophyte. The sporophyte is likened to an elongated spindle.〔 Research conducted by Lorbeer in 1924 revealed that two plastids are present in a cell when it is undergoing cell division, of which according to McAllister may vary in size.〔 The centrosomes of the species, much like ''Marchantia polymorpha'', are composed of two centrioles apposed end-to end, which are connected by a continuation of their cartwheel structures.
==References==
*
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「Phaeoceros laevis」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.
|
|