Abstract
Twelve isolates of Microsporum equinum and nine monoascospore cultures of Nannizzia otae were studied on Sabouraud dextrose agar, polished rice grain, and on Pablum cereal agar for their gross morphology and micromorphology. The urease activity of each isolate was determined on Christensen's urea broth, and the in vitro hair perforation test was performed according to Ajello and Georg's technique. The 12 M. equinum isolates were paired with nine tester strains of N. otae (108 crosses) and with five M. canis isolates that were nonfertile with N. otae (60 crosses). The M. equinum isolates were also paired with each other in all possible combinations (78 crosses) on soil-hair medium, Pablum cereal agar, and oatmeal salts agar.
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