Lesions 



789 



Gelatin.— The growth in gelatin is not very abundant, and forms 

 dense, slightly reddish, rounded clumps. Sometimes there is no 

 color. There is no liquefaction. 



Agar- Agar .—Upon the surface of agar-agar beautiful rounded, 

 glazed colonies are formed. They are at first colorless, but later be- 

 come rose-colored or bright red. The majority of the clusters re- 



""WJ 



F'g- 315- — Melanoid form of mycetoma. Section showing black granules 

 and general features of tlie lesions as they appear under a low-magnifying power. 

 Zeiss 02 (James H. Wright). 



f 



Fig. 316. — Melanoid form of mycetoma, showing structure and appearance 

 of the hyphse of the mycelium obtained from the granules. Zeiss apochromat; 

 4 mm. (James H. Wright). 



main isolated, some of them attaining the size of a small pea. They 

 are usually umbilicated like a variola pustule, and present a curious 

 appearance when the central part is pale and the, periphery red. 

 As the colony ages the red color is lost and it becomes dull white or 

 downy from the formation of aerial hyphas. The colonies are very 

 adherent to the surface of the medium, and are of almost cartilagi- 

 nous consistence. 



