212 



FAMILY OF SACCHAROMYCETACEAE 



On gelatin streaks, a whitish deposit forms. In gelatin stabs 

 the yeast shows a tendency to form lateral rays. In gelatin to which 

 must has been added, vesicles of carbon dioxide are formed here and 

 there. This yeast is able to ferment only dextrose and levulose. 



ZYGOSACCHAROMYCES MANDSHURICUS. Saito 1 



This yeast was isolated from Chinese yeast which is used to pre- 

 pare the " 1'eau de vie " in Manchuria, aft alcoholic drink known as 

 Sorgho. The cells are round or oval (6.5-9.5 JJL in diameter). The 

 giant colonies are round or oval with a flat edge. On plaster blocks 



Fig. 88-B. Zygosaccharomyces 

 Mandshuricus (after Saito). 

 Copulation and Formation of 

 the Ascs. 



Fig. 88-C. Zygosac- 

 charomyces Mand- 

 shuricus. Partheno- 

 genetic Ascs from 

 Cells of a White 

 Race (after Saito). 



Fig. 88-D. Zygosac- 

 charomyces Mand- 

 shuricus. Asporo- 

 genic Variety. Cells 

 from Sedimental 

 Growth in Wort at 

 20 C. (after Saito). 



in beer wort, and on Gorodkowa's medium, ascs are formed con- 

 taining one to four spores (45 ju in diameter). These result from 

 an isogamic copulation. The temperature limits for sporulation are 

 30 to 35 C. This yeast ferments dextrose, levulose, and mannose 

 energetically, saccharose feebly. 



ZYGOSACCHAROMYCES MELLIS ACIDI. Richter 



Isolated from honey undergoing an alcoholic fermentation, this 

 yeast possesses cells of small dimensions. The ascs are formed by 

 isogamic copulation. The yeast ferments glucose, fructose and sac- 

 charose actively and galactose feebly, but has no action on other 

 sugars. 



1 Saito, K. Mikrobiologische Studien iiber die Bereitung des Mandschurischen 

 Branntweins. Report of the Central Laboratory, South Manchuria Railway Co. 

 1914. Bull. Past. Inst. 12 (1915) 1. 



