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A spherical, cylindrical, or oval ascocarp which usually opens by a terminal slit or pore.



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.

References in periodicals archive ?
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.
Based on our observations, perithecial development takes 10-12 days, this contrasts with the indicated by Benjamin.
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).