Abstract
A study of azygosporic strains of Mucor hiemalis suggested that the strains were heterozygous for mating-type. The length of uninucleate sporangiospores from most azygosporic strains was 1·3–1·6 times the length of spores from tester strains. Sporangiospores from azygosporic strains were predominantly uninucleate but more than 35 % of the spores of the tester strains were multinucleate. It is possible, however, to find strains derived from azygosporic cultures which are normal in appearance and which have predominantly long uninucleate spores, as well as azygosporic strains which have relatively short uninucleate spores and a relatively high percentage of multinucleate spores. Azygosporic strains have been resynthesized by germinating zygospores derived from a cross of two normal strains of opposite mating-type, both of which were obtained as single vegetative spore isolates of a single azygosporic strain.
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