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Perithecium

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perithecium [‚per·ə′thē·shəm]
(mycology)
A spherical, cylindrical, or oval ascocarp which usually opens by a terminal slit or pore.
Perithecium 

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.
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Fruiting bodies: Stromata brick-red at maturity, eventually turning brownish-black to black with age; hemispherical, 3-7 mm across, confluent forming extensive lobed crusts; surface papillate with protruding tips of perithecia but ostiolar necks do not extend beyond the crust of the stroma; ostioles breaking exposing pore into perithecium.
The lignicolous fungi of Ginn Woods, Delaware County, Indiana by Nurtjahja, Kiki / Proceedings of the Indiana Academy of Science
 
 
 
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