Abstract
A taxonomical study of the Aspergillus was made centering on 403 strains of koji mold, with some other molds as reference. Morphological, physiological, and cultural characters were compared, and 20 mycological characters of each strain were submitted to component analysis by a computer, and the following characters were selected as the most significant key for taxonomical differentiation: Seriation of sterigmata, roughness of conidial walls, color of old cultures, diameter of conidia, and pink coloration of conidia in the anisaldehyde medium.In addition, the strains RIB 430 and Thom No. 113 were found to be the original isolate of AHLBURG and COHN; the strain Thom No. 108 was proved to be A. oryzae, and A. sojae SAKAGUCHI et YAMADA was definitely discriminated from A. parasiticus SPEARE.As a result, all the strains were proved to belong to two different clusters by the computer analysis, one being the A. oryzae group and the other, A. flavus group. The koji molds were placed in A. oryzae group including A. sojae SAKAGUCHI et YAMADA, A. tamarii KITA, A. oryzae (Ahlburg) COHN, A. oryzae var. viride, var. nov., and A. oryzae var. brunneus, var. nov., and the strains other than koji mold were placed in A. flavus group including A. flavus LINK, A. parasiticus SPEARE, and A. toxicarius, sp. nov.
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