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What is a perithecium?

What is a perithecium? Here are some definitions.

Noun
  1. (mycology) An ascocarp shaped like a skittle or ball, distinguished by a small pore, the ostiole, through which the spores are released one by one when ripe.
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Examples
A spore leaving the perithecium travels nearly straight up at first.
The asci are unitunicate, 8-spored with deliquescent base so that mature asci lie free in the perithecium at maturity.
Moeller, on the contrary, represents each body as a perithecium, and our examination confirms Moeller's view.
Since the perithecium grows out into the medium from the hymenium after nuclear pairing, this is ascohymenial development.
Features of the spores and the perithecium in which they occur suggest that this may be a fossil species of Savoryella.
When mature, a perithecium contains several hundred asci that are ejected by turgor pressure.

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