Abstract
1. Eleven strains of typical Aspergillus species were irradiated with ultraviolet rays. The authors obtained the Albino type mutants from 8 of them, i.e. A. nidulans, A. oryzae, A. tamarii, and A. wentii.2. From A. candidus no color mutants were obtained. The green or bluish species never produce black mutants and from the black species no green or bluish mutant.3. Color mutants of conidial heads obtained from each strain were classified into 8 types: i.e. Black, Brown, Cinnamon, Buff, Albino, Yellow, Yellowish Green, and Green.4. The mutants obtained were classified also from the characteristics other than the color of conidial heads, that is from the size of conidial heads, the pigment on the reverse of colonies, and the appearance of mycelia.5. The sclerotia producing mutant has been prevalently obtained from A. tamarii and A. ochraceus.6. The correlations were discussed between the classification of Aspergillus species and the tendencies of colorations of their color mutants.
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