SACCHAROMYCODES LUDWIGII 227 



In wort at the temperature of the laboratory, Saccharomyces lac- 

 tis'y forms a ring and scum in which the cells possess the same charac- 

 teristics as those in the sediment. This yeast acts like a top yeast. 

 Fermentation is active at first but ceases quite rapidly. The wort is 

 strongly discolored. No aroma seems to be formed. At the end of 

 five months and a half, 5.4 per cent of alcohol is formed. In milk, 

 this yeast produces no fermentation but provokes a strong peptoni- 

 zation of the casein. It ferments saccharose, dextrose, d-galactose, 

 but has no action on maltose or lactose. 



THIRD GROUP 



Yeasts multiplying by budding, in which the ascs always form 

 by parthenogenesis, all traces of sexuality having disappeared. Some- 

 times there is the formation of a rudimentary mycelium. In sugar 

 solutions a deposit is formed and, very much more slowly, a scum, 

 in which the vegetation is shiny without occluded bubbles of air. The 

 ascospores are smooth, round or oval, with one or two membranes, 

 germinating by budding or under exceptional conditions by a process 

 intermediate between budding and partition. Germination of the 

 ascospores is sometimes preceded by a fusion of these latter two by 

 two (parthenogamy). The greater number of the species in this group 

 produce the alcoholic fermentation. 



Genus VII. Saccharomy codes. Hansen 



Cells dividing by a process intermediary between budding * and 

 partition. Often there are rudimentary myceliums with very dis- 

 tinct transverse walls. Ascopores fuse (parthenogamy) two by two at 

 the moment of germination and develop in a single direction by a 

 process intermediary between budding and partition. 



SACCHAROMYCODES LUDWIGIL Hansen 

 Syn. SACCHAROMYCES LUDWIGII. Hansen 



This species was discovered by Ludwig 2 in the mucous secretions 

 of the oak in which he found associated a Leuconostoc and Endomyces 

 Magnusii. Ludwig first regarded it as a form of Endomyces mag- 



1 By its manner of multiplication, the genus Saccharomycodes is then inter- 

 mediate between the Schizosaccharomyces and the budding yeasts. It may also 

 be possible to separate other yeasts into a separate group. 



2 Ludwig, F. Ueber der Alkoholgarung und Schleimfluss lebender Baume. 

 Bericht. der Deutsch. Bot. Gesells. 4, 1886. 



