272 



FAMILY OF SACCHAROMYCETACEAE 



which the patient succumbed to the operation. It has round cells, 

 (1.5 to 15 or 20 p) slightly greenish, surrounded by a thick mucilag- 

 inous capsule. In cultures on carbo- 

 hydrate agar, the cells are also spheri- 

 cal and often appear in beaded forma- 

 tion. (Fig. 126.) Almost all of them 

 after a few weeks transform into 

 spherical ascs with a thick wall. They 

 contain 8 round ascospores. These 

 measure 34 /x in diameter. This species 

 grows on liquid media and produces 

 a sediment. On gelatin streaks, it 

 gives a grayish white colony. The 



On gelatin 



plates, white colonies are produced 

 which are round or scalloped and on 

 agar a thick growth, a little yellow and not scalloped. On agar 

 plates, it forms lenticular spots yellow or grayish. On potato, a 

 mucous coating, white or yellowish, is formed and on carrot an 

 abundant viscous growth. 



Fig. 126. Saccharomyces Blan- 



chardi. Sucrose Agar Culture gelatin IS slowly liquefied, 

 after 48 Hours (after Blanchard, 

 Schwartz, and Binot). 



SACCHAROMYCES MINOR. Engel 1 



The yeast was found in a fermentation of bread. It has spherical 

 cells 6 ju in diameter, united in chain formation and in little groups 

 of six or nine cells. The ascs are 7.8 ju, and contain 2 to 4 ascospores 

 of 3 ju in diameter. 



SACCHAROMYCES UVARUM. Beijerinck 2 



This yeast is not well known. It was found in a bottle of grape 

 juice to which saccharose had been added. It produced an active fer- 

 mentation and was associated with S. sphaericus (Naegeli). It is a 

 yeast which especially ferments maltose. In yeast water to which 

 maltose is added it produces acetic acid. On nutrient gelatin, ascs 

 are formed easily and in large numbers with 4 ascospores. 



1 Engel, Les ferments alcooliques. Thesis for the Doctorate of Sciences, Paris, 

 1872. 



2 Beijerinck, M. W. Ueber Regeneration der Sporenbildung bei Alkoholhefen. 

 Cent. Bakt. 4, 1898. 



