Definitions for "cleistothecium"
the closed spore-bearing structure of some fungi (especially Aspergillaceae and Eurysiphaceae) from which spores are released only by decay or disintegration; -- called also cleistocarp.
round or oval sexual fruiting body without an opening and with asci irregularly dispersed in centre
tiny, spherical fruitbody (ascoma) in the Ascomycota that lacks an opening and from which the ascospores can only be released by decay or disintegration of the outer wall. View an illustration of the cleistothecium.