Abstract
W. Yonezawa and F. Aoki clarified that a thiaminase-carrying yeast like fungus isolated from the oral cavity belonged to genus Trichosporon. Further, M. Ota reported a specific thiamine requirement of this fungus. The author compared this fungus with some other strains of Trichosporon cutaneum, and found that the Y・A strain can be discriminated from Trichosporon cutaneum from the morphological, physiological, as well as nutritional points of view and also in the production of thiaminase II. The author concluded that the fungus is a new species, closely related to, but different in some respects, from Trichosporon cutaneum.
