YEASTS AND MOULDS. 



585 



of gelatine the growth resembles that of Tricophyton tonsurans, but 

 the liquefaction takes place more slowly, and there is a more distinct 

 yellow colour. On agar the growth is white, dry and firmly 

 adherent. 



Tricophyton tonsurans [Fungus of ringworm). — Mycelial 

 filaments and spores occur on the crusts and in diseased hairs. 

 In plate-cultivations white colonies are formed, and Hquefaction 

 ■quickly follows. In test-tube cultivations the gelatine is liquefied 



Fig. 232.— Head and Neck ov Cam' with Advanced Eingwoem (Brown). 



and the fungus forms a membrane on the liquid jelly which is white 

 above and yellow beneath. The surface of the growth is powdery 

 In man the disease varies in appearance in different parts of the 

 body. Cattle, horses and dogs also suffer from ringworm ; but sheep 

 and pigs rarely, if ever. The disease is very common in calves. 

 Sometimes a small portion of the skin is diseased; in other cases, 

 the head, neck, chest and abdomen, or even the whole trunk, may be 

 covered with scabs or crusts. There is often loss of hair in patches, 

 and the skin may be covered with scurf. The disease is transmissible 



