A novel representative of the yeast genus has been recovered 190 times during the period 1971 to 1976. We regard this organism as belonging to a new species, Strains were found in the necrotic tissue of 16 species of cactus and in the crops of 3 species of which utilize the cacti as host plants. Isolates were obtained from widely separate geographic localities (throughout Mexico, Southwestern United States, and Hawaii). The new species forms predominantly two-spored asci. Both homothallic and heterothallic strains were observed. The metabolic capability of , like that of , is limited to oxidative utilization of only a few compounds. can be differentiated from by its strong growth on D-glucosamine and by the lower guanine-plus-cytosine content (36.3 to 37.5 mol%) of its nuclear deoxyribonucleic acid. The type strain of is UCD-FST 76-243A (= ATCC 34932 = CBS 6926).


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