ROGER'S TORULA 313 



lactis d are much smaller than those in Torula lactis e. In the first 

 they are 2.5-4. 12 /z and in the other 3.1-5.6ju. On gelatin in beer 

 wort, in plates, both species form spherical or torpedo-shaped colonies. 

 The giant colonies of Torula lactis d have almost a flat surface while 

 the others possess a concentrically folded surface. In beer wort 

 or grape must, both species produce a fine ring but cause no fermenta- 

 tion. The wort is not discolored and there is no formation of an aroma. 

 This does not ferment milk. Neither does it ferment lactose, saccha- 

 rose, dextrose, d-galactose and maltose. 



Torula No. 15, Dombrowski: The shape of the cells is oval. On 

 plaster blocks, the cells possess a large fat globule. On beer wort 

 gelatin plates, this species produces circular or torpedo-shaped colo- 

 nies. The giant colonies show slight development with concentric 

 zones. In carbohydrate liquid media, this species produces no fer- 

 mentation but develops abundantly. At 23-25 C. the scum is a 

 bright red. This yeast produces a strong cloudiness and a disagree- 

 able odor. Many other milk yeasts have been isolated by Pierroton 

 and Riboni Weigmann, Kalanthar, Jensen, and Maze; they are too 

 insufficiently known to be described here. 



C. YEASTS FROM FATS 



SACCHAROMYCES OLEI. Van Tieghem 1 



This yeast was accidentally observed by Van Tieghem in olive oil 

 in which there were entrained droplets of water. It possesses oval 

 cells arranged like heads in a chain. These bead-like structures break 

 off and the isolated cells bud in order to form new ones. The 

 cells measure on an average 4/z and 2.5 jit. Their contents is a rose 

 color. This yeast develops in all stretches of the medium without 

 growing on the surface. The oil undergoes a marked change, becoming 

 acid and saponifying. 



ROGER'S TORULA 



This yeast was isolated from different samples of butter by Rogers. 2 

 It possesses the property of decomposing fats with the formation of 

 fatty acids. The cells are elliptical (3 to 5/z) and show a slight 

 tendency to form chains or masses. It ferments maltose slowly but 

 does not act on other sugars (lactose, d-mannose, levulose, dextrose). 



1 Van Tieghem. Sur la vegetation dans 1'huile. Bull. Soc. Bot. France. 

 28, 1881. 



2 Rogers, A. Eine gespaltende Torulahefe aus Buchsenbutter isoliert. Cent. 

 Bakt. 10, 1903. 



