We describe , a new species of yeast which is closely related to . , 20 strains of which were isolated, is heterothallic and occurs in nature in both the haploid state and the diploid state. It produces asci with four hat-shaped spores, which are rapidly released upon maturity. The guanine-plus-cytosine content of its nuclear deoxyribonucleic acid is 33.4 to 33.7 mol%. The deoxyribonucleic acids of and var. show approximately 50% homology, but the two species are not interfertile. Moreover, the two species are separated geographically and by host plant. occurs principally in necrotic tissue of the columnar cactus in the West Indies, and var. occurs in rots in Australia. The type strain of is strain UCD-FST 82–651A (= ATCC 56267 = CBS 7111).


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