RED YEASTS AND BLACK YEASTS. 407 



opinion, this fungus is probably allied to Dematium. P. LINDNER 

 (XXXVI. b) mentions a black yeast, isolated by Zeidler, and 

 having ellipsoidal cells, measuring 0.6 //. in length. On wort 

 gelatin it develops with a damp surface and mesenteric folds, 

 covered by a scanty growth of wool. Hansen states that black 

 yeasts are not infrequently found in atmospheric dust, but he 

 does not credit them with any practical importance. G. GROTEN- 

 FELT (II. and III.) gives black yeast as the cause of blackening in 

 cheese. 



