MOLD DISEASES 



71 



the center, though continuing to spread at the edge, thus 

 producing a ringlike growth that has given origin to the 



Fig. 28. A mold (Trichophyton) which produces ringworm. At o 

 is a bit of hair with the mold spores on the outside, and at ^ a 

 figure of the mold itself highly magnified. 



name. The affection is a 



troublesome one to heal, 



especially when it gets into 



the scalp ; it may produce 



bald spots, but is never very 



serious. Two or three types 



of this disease have been 



found to be produced by 



two or three kinds of molds. 



Fig. 28 shows one of the 



common 'species that is the 



cause of ringworm. At a 



is shown a bit of hair with 



the mold fungus and mold 



spores growing upon it, and 



at b the fungus more highly 



magnified. Of the several species of molds that produce 



this trouble some are more liable to grow upon the hair 



Fig. 29. Two pieces of hair from the 

 scalp infested with a mold (Microspo- 

 ron) producing ringworm. The upper 

 figure shows the masses of spores 

 attached to the outside of the hair ; 

 the lower figure shows the mold 

 thread lying beneath the spores. 



