The evolutionary affinities among several morphologically and physiologically similar species of the ascogenous yeast genus were studied by a technique which involved genome comparisons in combination with nuclear deoxyribonucleic acid base composition determinations. The results revealed a new member of the genus that was recovered five times in 1968 from slime exudates of (cottonwood trees) in British Columbia and Alaska. This new species is named because of its specific habitat in exudates of cottonwood trees. is homothallic and occurs naturally in the haploid state. Conjugation between vegetative cells precedes sporulation, and up to four hat-shaped spores are produced in zygotes. The spores are liberated from the asci soon after formation. resembles but differs from these species in habitat, guanine-plus-cytosine content of the nuclear deoxyribonucleic acid, maximum growth temperature, and ability to assimilate several carbon compounds. The type strain of is UCD-FS&T 68-628C (= CBS 8094 = ATCC 48773).


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