Abstract
The authentic strains of four species of the genus Hansenula and one strain of the genus Torulopsis were obtained by the courtesy of Dr. L.J. Wickerham, the Northern Utilization Research Branch, U.S. Department of Agriculture. Antigen analyses were performed with the strains by means of slide agglutination method using monospeific antisera homologous to antigens of the genus Candida. Then, antiserum of a species was absorbed repeatedly with heated cells of several species of the genus Candida in order to find a new antigen, until the absorbed antiserum was exhausted. No new thermostable nor thermolabile antigen was found, although antigenic structures of the species were established by the experiments. They were confirmed reciprocal absorptions, and the antigenic structures of the five species were presented. The antigenic structure of H. ciferrii is the same to that of H. anomala, and the antigenic structure of H. beijerinckii is identical to H. californica. H. jadinii and T. utilis shows the same antigenic structure of C. utilis, and H. angusta bears resembrances to the antigenic structures of C. krusei and C. utilis.
