SACCHAROMYCES ELLIPSOIDEUS 



241 



Microscopic appearance of the cells in the 

 scum follows: At 20-28 C. the cells in the scum 

 have almost the same shape as those in the sedi- 

 ment. At 15 to 3 C. and in old scums, one may 

 see colonies composed of elongated cells in the 

 shape of sausages in which the appearance is 

 much like a mycelium. (Fig 111.) In yeast water 

 gelatin, on streaks, one may see at the end of 

 sixteen days a very irregular border. This yeast 

 ferments d-mannose, levulose, d-galactose, sac- 

 charose and maltose. 



LOGOS YEAST. Van Laer and Denamur 



Fig. 111. S.validus. 

 Vegetative Cells 

 from Scum at 13-3 

 C. (after Hansen). 



Here we shall again mention a species whose 

 morphology is very little known but which is of 

 very much importance industrially. It was 

 isolated by Van Laer and Denamur 1 from among the yeasts used 

 in the brewery of Logos and Company of Rio de Janeiro in Brazil. 

 Its origin is unknown; it seems to have originated in a spontaneous 

 fermentation of sugar-cane juice. It has the shape of S. pastorianus. 

 During the fermentation the cells remain attached in large masses 

 which settle to the bottom of the fermentation vats. It is a bottom 

 yeast with a slow fermentation which produces little alcohol. It is 

 very much attenuated. It ferments dextrine, inuline, dextrose, d-man- 

 nose, d-galactose, levulose, saccharose, maltose, raffinose, melibiose, 

 and a-methylglucoside. 



Fig. 112.- 

 soideus. 



SACCHAROMYCES ELLIPSOIDEUS. Hansen 

 Syns: s. ELLIPSOIDEUS i. Hansen. s. ELLIPSOIDEUS. Reess 



This yeast was discovered by 

 Hansen 2 on the surface of raisins. 

 It is a bottom yeast which 

 plays an important r61e in vini- 

 fication. In the sediment in 

 wort cultures, it possesses ellip- 

 tical or round cells; elongated 

 cells are not common. (Fig. 112.) 



S.ellip- 

 Young 



Cells from Sedi- The temperature limits for bud- 

 Wort (after Han- ding on beer wort are: minimum, 

 sen). 0.5 C., maximum, 40-41 C. 



Fig. 113. Ascs 

 ellipsoideus 

 Hansen) . 



of S. 

 (after 



1 Van Laer, H., and Denamur. Notice sur une levure attenuation, limite 

 tres e"leve"e. Moniteur scientific, 1895. 



2 Hansen, E. C. See references for S. pastorianus. 



