Fig. 2. Comparison of variations in growth of fungi in artificial medium and on human 

 skin. A, Aspergillus species growing on corn meal agar. Successive rings of spores are due to 

 variation in nutritional opportunities. In B, three distinct rings are present in lesion infected 

 with M. lanosum. It is suggested that the formation of rings may be due to nutritional factors 

 rather than to an allergic phenomenon as commonly supposed. 



