244 



FAMILY OF SACCHAROMYCETACEAE 



yeast ferments saccharose, dextrose, levulose and maltose. It possesses 

 characteristics of a top yeast. The ascospores according to Mar- 

 chaud undergo a copulation just before they germinate. 



SACCHAROMYCES TURBEDANS. Hansen 

 Syn: s. ELLIPSOIDEUS n. Hansen. s. ELLIPSOIDEUS. Reess 



Ordinarily this is a bottom yeast which was 

 found by Hansen l in beer and first described 

 under the name of S. ellipsoideus I. He found 

 a very evident trouble in beer and this yeast 

 may be regarded as an unfavorable species, 

 more so than S. validus. In sediments in beer 

 wort it always has round or elliptical cells. 

 Elongated cells are rare. (Fig. 115.) The 

 temperature limits for budding in beer wort 

 are: minimum, 0.5 C., maximum 40 C. 



Fig. 115. S. Turbi- 

 dans. Young Cells 

 from Sediment in 

 Beer Wort (after 

 Hansen). 





Fig. 115-A. Parasaccharomyces Ashfordii, Anderson. 



1, Cells from Young Beer Wort Culture. 2, a, Moniliform Clusters beneath the Surface of an Old 

 Agar Plant; b, Cells from Surface of the Same Culture. 3, Young Cells. 4, Old Cells. 



Temperature Limits for Ascospore Formation 

 At 35 C. no ascospore formation. 



33-34 appearances of first rudiments in 31 hours. 



' 27 

 " 23 



' 22 



" 27 



" 42 



" 5J days 



" 9 " 



33 



31.5 



29 



25 



18 



11 



8 



4 no ascospore formation. 



1 Hansen, E. C. See references under S. pastorianus. 



