Abstract
Mycelial extracts of 32 strains representing 15 species of the genus Aspergillus were subjected to starch-gel zone electrophoresis to detect sites of leucine aminopeptidase, esterase, or phosphatase activity. Invariant and variant sites of esterase and phosphatase activity were found for 4 species. Esterase and phosphatase zymograms seemed to provide a biochemical means to distinguish species in this genus.