158 



INFECTIONS CAUSED BY MOLDS 



having as many as 12 or 15 crosswalls, and are truly spindle-shaped 

 with thick, rough walls. In M. Audouini a few macroconidia similar 

 to those seen in M. Canis may be found in some strains, but most of 



Trichophyton 



Epidermophyton 



Microsporum 



Fig. 79. Spore types in the three genera of dermatophytes. 



them are smaller, have only one or a few crosswalls, and the walls 

 are usually smooth except near the tip. In M. gypseum the macro- 

 conidia are very numerous, broader in proportion to length than in 

 M. Canis, and the walls are nearly smooth. 



