ALCOHOLIC FERMENTS. 



199 



Microscopic appearance of the cells in the films : 



At 20-34 C. and 6-7 C., the cells are smaller and more 

 sausage-shaped than in the sedimentary yeast. 



At 13-15 C., freely-branched and strongly-developed 

 colonies of long or short sausage-shaped cells, often with 

 verticillated branches (Fig. 57). 



In old cultures of films, the cell forms are the same as at 

 13-15 C. 



Streak cultures of this species in wort-gelatine (wort with 

 the addition of about 5 '5 per cent, of gelatine), in the course 

 of eleven to fourteen days at 25 C., give in contradistinction 

 to the other five species a characteristic net-like structure, by 

 means of which it can be distinguished by the naked eye from 

 other species. 



SACCHAROMYCES ELLIPSOIDEUS II. (HANSEN). (Figs. 58, "59.) 



Usually a bottom-fermentation yeast. 



Sedimentary forms grown in wort : Mostly oval and round 

 cells; sausage-shaped cells are rare (Fig. 58). 



FIG. 58. Saccharomyces ellipsoideus II. (HANSEN). Cell-forms of young sedimentary 

 yeast (after HANSEN). 



It was separated from beers which showed yeast-turbidity ; 

 is a species which causes yeast-turbidity, and has been shown 

 by HANSEN'S experiments to be more dangerous than Sacch. 

 Pastorianus III. 



