ALCOHOLIC FERMENTS. 



165 



Microscopic appearance of the cells in the films : 

 At 20 28 C. nearly the same forms as in the sediment- 

 ary yeast. 



At 13 15 C. strongly-developed mycelium-like colonies 

 of very elongated sausage-shaped cells (Fig. 38) are moderately 

 frequent. 



In old cultures of films the cells are smaller than in the 

 sediment ; very irregular and sometimes almost thread-like 

 cells are found. 



SACCHAKOMYCES PASTOKIANUS II. HANSEN. 

 (Figs. 39, 40.) 



Fie. 39. 



Saccharomyces Pastorianus II. Hansen. Cell-forms of young sedimentary 

 yeast, after Hansen. 



Feeble top-fermentation yeast. 



Sedimentary forms grown in wort : Mainly elongated 

 sausage- shaped cells, but also large and small oval and round 

 cells (Fig. 39). 



It frequently occurred in Hansen's analyses of the air in 

 the brewery ; appears to belong to the species which do not 

 cause diseases in beer. 



Ascospore-formation (Fig. 32, 3) : 



