MOULDS 



175 



of the spores. It is commonest in children in schools, and 

 appears also where uncleanliness prevails, as evidenced by 

 epidemics from a badly kept barber shop. The fundus 

 grows into the hair sheath and inflames its base. The dis- 

 ease appears characteristically as circular, scaly patches, 

 which are rapidly denuded of hair. This disease, so far as 

 known, is only transmitted from man to man. 



FIG. 56. These two half-plates show three months' growth on peptone- 

 maltose agar of two megalosporon varieties of the ringworm fungus. Natural 

 size. (Park.) 



Favus. This disease is caused by a mould called Achorion 

 Schonleinii, and affects chiefly the hairy portions of the 

 body. Animajs as well as man are affected, and while it is 



