nPerithecium(Bot) An organ in certain fungi and lichens, surrounding and enveloping the masses of fructification.
Century Dictionary and Cyclopedia
nperitheciumIn botany, a cup-shaped envelop (or ascocarp) with the margin incurved so as to form a narrow-mouthed cavity, inclosing the fructification of certain fungi, lichens, etc. In the Ascomycetes, for example, it is flask-shaped with a single narrow opening, the ostiole. The asci arise from ascogenous hyphæ, either from the base of the perithecial cavity or from all points of the inner surface. See cuts under Cordyceps, ergot, and Spermogonium. Also perithece.
Webster's Revised Unabridged Dictionary
NL., fr. Gr. around + box
Fertilization and Development of the Perithecium.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3" by Various