OCCURRENCE OF YEAST MATING TYPES IN NATURE,

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Abstract
Several spp. of yeasts exist in nature as haploid mating types. Ascospores were produced when strains of opposite types were mixed on a sporulation medium. This suggested that some yeasts considered to be nonsporogenous could be cultures consisting merely of a single mating type. Nearly all of the Torulopsis sphaerica strains studied produced ascospores when mixed with an appropriate strain of the opposite mating type. Such mixtures were typical of the sporogenous sp. Zygosaccharomyces lactis. Several strains of Z. lactis which had become nonsporogenous, probably through selection of colonies derived from haploid cells, likewise produced spores when mixed with the opposite mating type. Endomycopsis ohmeri. and the yeast variously known as Candida chodati, Sporotrichum anglicum. and Dematlum chodati. also formed ascospores when mated.
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