Abstract
In previous paper* we had reported ultraviolet irradiation and its mutants of Aspergillus usamii SAKAGUCHI et al. (one of the black Aspergilli), in which we had found consecutively decoloring conidial heads type -Blackish Brown Type, Brown Type, Brown Type and Tan Type -comparing with original black type. The authors studied these mutants morphologically and physiologically and named Tan Type mutants Aspergilluus usamii mut. shirousamii, (prefix shiro means white). Description of this mutant was shown in the text (see page 972). We obtained additionally by ultraviolet ray irradiation the Albino Type mutant of Asp. usamii mut. shirouomii. When mutant strains, or mutant and parent strain of Asp. usamii are grown in juxtaposition, heterocaryotic conidial heads develop along the interface between the two colony areas. (Fig. 1). In the combination of Tan Type mutant and Brown Type mutant, black heterocaryotic heads de_??_elop. On Asp. usamii mut. shirousamii we found: (1) Amylolytic and acid-producing powers of the mutant was almost the same as those of parent strain as shown in the Tables. (2) The mutant was found to be a powerful saccharifying agent for alcoholic fermentation.
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