92 



RED YEAST. 



SEVERAL RED YEASTS ARE KNOWN. THE RED, WHITE AND BLACK 

 YEASTS ARE NOT TRUE YEAST-PLANTS. 



Origin. Very common in air. 

 Color. Bed or pink. 



Form. Round [or oval cells with granular proto- 

 plasm which stains irregularly. Multiplies by budding- 

 distinction from bacteria. 



Motility. None. 



Sporulation. None. 



Anilin Dyes. Stain readily. 



Growth. Abundant, though somewhat slow. 



Gelatin Plates. Colonies are small, round, elevated, moist and pink- 

 colored. 



Stich Cultures. Growth absent from the lower part of the tube. Spreads 

 slowly over the surface, forming a thick, moist, bright red covering. 



Streak Cultures. On agar, develops in a few days as a thick, slimy, 

 spreadftig, pink-colored growth. On potatoes, forms the same pigment. 



Temperature. Grows best at ordinary temperature. 

 Behavior to Gelatin. Does not liquefy. 

 Aerogenesis. Does not produce alcohol. 

 Pathogenesis. No effect on animals. 



