1. Sclerotiumm Rolfsii SACC. is a group species comprising numerous strains (biologic forms ) which can be distinguished by the phenomenon of aversion. The present work was undertaken to characterize the strains by physiological characters including cultural features and pathogenicity. 2. For cultural features the following charcaters we r e taken into consideration : color, ruster, topography, structure, layer of mycelia and distribution of sclerotia formed on plate. Those characters can be recognized as constant and characteristic under the same conditions. 3. The fungus tolerates acid and alkali, and produ c es a considerable amount of acid in the course of growth. The toleration and amount of acid produced depend upon the strains of the fungus, while temperature for growth shows no difference among strains. 4. From experimental evidence w i th Str. XXXIV (48) the pathogenicity of the fungus is found to be characteristic of the strains. 5. The most pronounced and distinguishable characters of the strains are found in cultural features, specially when cultured on Koji extract agar.
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