YEASTS AND MOULDS. 



179 



FIG. 92. 



ft 



viduals living in the tropics. Two varieties, the pale and the 

 black, have been described. 



Form. Branched filaments resembling the actinomyces Strep- 

 tothrix in the mycelia. Spores are seen. 



Cultivation. In liquid media containing vegetable infusions 

 growth occurs best. Temper- 

 ature of 37 C. most suited. 

 The colonies near the surface 

 become colored red. 



Agar Glazed colonies, at 

 first colorless, then rose-col- 

 ored, about the size of a pea, 

 with the central part umbili- 

 cated and pale. Gradually the 

 rose color fades. 



Acid Potato. A slow and 

 meager growth. 



Pathogenesis. Only local re- 

 action has been caused by in- 

 oculation in animals. In man 

 the disease usually follows a 

 slight injury and attacks the leg 

 or foot, slowly forming a nodu- 

 lar growth, which in the course 

 of months or a year begins to 

 soften and ulcerate, and with 

 the sero-pus are discharged 

 numerous little granules, some 

 black, some pink, containing 

 mycelia. The limb becomes 

 much deformed, the tissue 

 vascularized, and the degenerated area 

 tothrix filaments.- 



ffi 



Streptothrix Madura* in a section of dis- 

 eased tissue( Vincent). 



filled with the strep- 



Staining. The organism itself stained with ordinary stains. 

 Gram's method for the tissue. 



Streptothrix Farcinica. (Nocard.) Bovine Farcy, Farcin du 

 Bceuf. 



