W.Yonezawa and K.Nishio have reported a new thiaminase carrying Candida isolated from the oral cavity. The author compared this new Candida with 16 species (25 strains) belonging to the genus Candida including 5 strains of Candida parapsilosis, and found that Y・N strain can be discriminated from Candida parapsilosis from the view points of morphology, physiology, nutritional requirement and the property of producing highly active thiaminase. It was led to the conclusion that the fungus was a new species, closely related to, but different in some respects, from Candida parapsilosis and the thiaminase of low activity was widely distributed in the genus Candida.