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A spherical, cylindrical, or oval ascocarp which usually opens by a terminal slit or pore.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the microscopic fruiting body of fungi of the group Pyrenomycetes. The perithecium opens by a crack or fissure. It may be globose, hemispheric, urceolate, bottle-shaped, or pear-shaped. Perithecia may form on the mycelium, on the stroma (the supporting framework of the mycelium), or within the stroma. Pouches filled with spores develop in the peritheci-um’s cavity; in some Pyrenomycetes, unicellular or multicellular filaments, or paraphyses, form as well. Cleistothecia, or cleis-tocarps, formerly were included among perithecia. Cleistothecia are the completely closed fruiting bodies of the fungi Plectascales and Erysiphales.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
It is characterized by effused, applanate to pulvinate blackish stromata with brown tones when young, inconspicuous up to 1/4 exposed perithecial mounds; ostiolar truncatum-type discs; amyloid apical rings and brown ellipsoid-inequilateral ascospores with straight germ slits spore-length and dehiscent perispore in KOH.
The time required for perithecial development and ascospore discharge from inoculated corn in the plots did not coincide with anthesis in 2000.
According Benjamin the characteristics of the perithecial wall, the evanescent asci and light-colored spores, the appendages surrounding the ostiole of the perithecium, and the manner in which the ascospores are discharged in the form of an elongate cirrus suggest a relationsship to the genus Chaetomium.
Supported by subculturing on oatmeal agar with Lupinus sp., orange-brown to copper-colored fruiting bodies developed until day 8 (Figure 2b); after 14 days of incubation, these bodies were identified as perithecial ascomata (diameter 200 [micro]m-300 [micro]m).