670 



THE PARASITIC HYPOMYCETES 



size of a pin's head. On gelatin, growth is very slow, 

 tufted almost translucent flocculi appear. 



In broth, small white 



FIG. 314. M alassezia furfur. 



Experimental inoculation. Positive results have been obtained by inocu- 

 lating cultures on the human arm (Spielschka, Matzenauer). 



In rabbits, by rubbing a culture of the fungus into a shaved area of the 

 skin and protecting the inoculated part with a dressing, characteristic patches 

 are formed in about a week. 



Species of malassezia found in the tropics. 



[2. Malassezia tropica. M. tropica is the infecting agent in Pityriasis 

 versicolor flava (Tinea rosea) a common disease in Ceylon. The fungus has 

 a thick, irregular, constricted mycelium. 



[3. Malassezia macfadyeni. This fungus is the cause of another mycotic 

 pityriasis in Ceylon, Pityriasis versicolor alba. The fungus has a short, 

 slender, straight mycelium. 



[4. Malassezia mansoni. (Syn. : Mierosporon mansoni). This species is 

 the cause of Pityriasis versicolor nigra, a variety described many years ago by 

 Manson as occurring in South China. The parasite contains much dark 

 pigment in the mycelial tubes, and in culture in maltose-agar produces black 

 hemispherical colonies. It is very common in Ceylon.] 



SECTION III. THE GENUS TRICHOSPORUM. 



Parasites of the genus Trichosporum are fungi which grow on the hair of the 

 head, beard and moustache and form nodosities of firm but variable consist- 

 ence. The parasite was first found in Colombia, South America, on the hair 

 of a woman affected with Piedra}- Cases of Trichosporosis have since been 



[* Piedro, a stone : from the consistence of the nodosities, which though very firm 

 are not so hard as the name would indicate (Manson). ] 



