538 



PATHOGENIC FUNGI 



though it is not so easily cultured. Infection experiments with 

 cultures have hitherto failed. 



It is impossible for us to describe in detail the botanical 

 characters presented in cultures by the three groups of parasitic 



FIG. 167. a, Photograph of drawing of Achorion schonleinii on Sabouraud's 

 maltose agar. c, Photographs of cultures of Achorion quinckeanum. 

 (The central culture of c was isolated from a cat, and the two side tubes 

 from a man infected from it.) b, Side view^to show elevation of growth. 



skin fungi, and we can only mention certain commonly occur- 

 ring characters. In all there is a free production of a septate 

 mycelium, and usually, by a lateral budding from the hyphse or 

 by the breaking up of the protoplasm of the thread, there is the 

 formation of bodies resembling those described as spores which 

 occur in affected tissues. This spore formation often shows a 



