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Sterigma : ウィキペディア英語版
Sterigma

In biology, a sterigma (pl. sterigmata) is a small supporting structure.
It commonly refers to an extension of the basidium (the spore-bearing cells) consisting of a basal filamentous part and a slender projection which carries a spore at the tip.〔 The sterigmata are formed on the basidium as it develops and undergoes meiosis, to result in the production of (typically) four nuclei. The nuclei gradually migrate to the tips of the basidium, and one nucleus will migrate into each spore that develops at the tip of each sterigma.〔
In less common usage, a sterigma is a structure within the posterior end of the genitalia of female Lepidoptera.〔
It also refers to the stem-like structure, also called a "woody peg" at the base of the leaves of some, but not all conifers, specifically ''Picea'' and ''Tsuga''.〔
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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