翻訳と辞書 |
Platyzoma
''Platyzoma microphyllum'', the sole species in genus ''Platyzoma'', is a fern native to northern Australia. It occurs in the Kimberley region of Western Australia; in the Northern Territory and Queensland, and in northern New South Wales, where it is considered endangered. Vernacular names include Braid Fern. == Characteristics == ''Platyzoma'' is unusual among ferns in that it may display incipient heterospory.〔(Platyzoma--A Queensland fern with incipeint heterospory ), Tryon, Alice AmJBot 51(9):939-942.〕 Microsporangia produce 32 microspores, each 71-101μm in diameter. Megasporangia produce 16 megaspores, each 163-183μm in diameter. Microspores produce a filamentous microgametophyte, which lacks rhizoids and gives rise only to antheridia. Megaspores produce spatulate megagametophytes with rhizoids, which produce archegonia. Megagametophytes may later produce antheridia, making them functionally bisexual. Development of gametophytes is not endosporic.〔(Plants: evolution and diversity ), Martin Ingrouille, Bill Eddie 2006. Cambridge University Press.〕
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「Platyzoma」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.
|
|