OF ki:d yeast. 



235 



Tliese injxelial formations may also brancli and reach a 

 Icng-th of 80 f-i. without bearing any cells at their ends (2). 

 In peptone solutions these plienomena very soon make their 

 appearance. 



This mycelium is eviden.tly also the cause of the peculiarity 

 of this species forming a Ji/in on the surface of the nourishing 

 solutions ; this film, when the culture is shaken, breaks into frag- 

 ments and sinks to the bottom. 



Some time ago a kind of i-ed yeast was described by Allan 

 P. S-iVan (Centr. Bl. f. Bakt. II. No. I ; 1896) of which this author 

 remarks : " In cover glass cultures polymorphism is marked with 

 a tendency to grow in chain form with septate hyphae like Oidinin 

 lactis." This condition lias never been observed with the species 

 here described, nor was tlie tendency to form the ascospore-like 

 globular masses Swan mentioned and whose ascospore nature 

 was not proved, as /Jay has pointed out. Our species and Swan's 

 red yeast however agree in the mode of growth of the colonies on 

 gelatine and in liquefying gelatine, furtlur in form and size. The 

 power of liquefying gelatine however appears to be much more 

 energetic in the species described by Szca?/. 



Saccharoinyces Keiskcana, nov. spec. 



Cells (;f this kind of yeast were obtained from the same 

 gelatine plate which yielded the foimer species. The pink 

 coloured colonies differ considerably in intensity and shade ol 

 colour from those of the former species and from those of S. 

 rosaceiis. It forms neither ascospores nor mycelium, and only 

 multiplies hy the usual mode of gemmation. The young cells 

 soon separate from the mother cells and do not form connections, 

 as the top yeast variety of S. cercvisiac does. 



The cells are perfectly globular ; usually of 5.1 /(. in dia- 

 meter, but if well nourished reaching a diameter 9 /.<. 



