New Latin peri– Greek thēkiondiminutive ofthēkēcasedhē- in Indo-European roots
American Heritage Dictionary of the English Language, 5th Edition
Perithecium Sentence Examples
Ascus from perithecium containing six spores, X30o.
We find two chief types of fruit bodies in the lichens, the perithecium and apothecium; the first when the fungal element is a member of the Pyrenomycetes division of the Ascomycetes, the second when the fungus belongs to the Discomycetes division.
The perithecium is very constant in form and since the gonidia take no part variations are of value in classification some more details may be added.
The Ascolichenes are again divided into Pyrenocarpeae or Pyrenolichenes and Gymnocarpeae or Discolichenes; the first having an ascocarp of the nature of a perithecium, the second bearing their ascospores in an open apothecium.