A Cleistothecial Mutant of the Perithecial Fungus Gelasinospora calospora

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Abstract
A spontaneous mutant of G. calospora, which produces small cleistothecial bodies each containing 1-5 asci with viable ascospores, is described. From most morphologic characteristics the fungus can be diagnosed as a new sp. of the cleistothecial genus Anixiella. When perithecial and cleistothecial strains of G. calospora are paired, perithecia are formed yielding ascal clusters similar to those described in cases of chromosomal translocation in Neurospora crassa, i.e. spore-color segregations for white, brown, and black spores are produced. Black spores produce cultures that segregate in an essentially 1:1 ratio for the ascocarp characters. Cleistothecial segregants show only a biotin deficiency, similar to that of perithecial strains, indicating the mutation is not a simple, 1-locus auxotrophic type. The significance of the mutation relative to pyrenomycete systematics is discussed.

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