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SUMMARY
Ionizing radiations from radium and polonium were used to produce a number of mutants in a monosporous strain of Aspergillus niger. The alpha radiation is considered responsible for the mutant strains obtained. A yellow-colored mycelial strain FA #301 was found to be stable. The other variants had varying degrees of instability and tendencies to form sectors. Some of the variants were characterized by dwarf and giant conidial heads. Morphological differences in the mutants were determined by microscopic examination.