| Noun | 1. | class Plectomycetes - class of fungi in which the fruiting body is a cleistothecium (it releases spores only on decay or disintegration) class - (biology) a taxonomic group containing one or more orders Ascomycota, Ascomycotina, subdivision Ascomycota, subdivision Ascomycotina - a large subdivision of Eumycota including Hemiascomycetes and Plectomycetes and Pyrenomycetes and Discomycetes; sac fungi; in some classification systems considered a division of the kingdom Fungi Aspergillales, Eurotiales, order Aspergillales, order Eurotiales - order of fungi having a closed ascocarp (cleistothecium) with the asci scattered rather than gathered in a hymenium |