Merck Manual

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Normal hair and an M canis -infected hair
Normal hair and an  <i >M canis</i> -infected hair
Normal hair and an M canis -infected hair

This is a 40X image of a normal hair (thin arrow) and a an infected hair (thick arrow). Note the cuffs of spores on the outside of the hair shaft. Animal dermatophytes show these cuffs or ectothrix spores.

Courtesy of Dr. Karen A. Moriello.