SCHIZOSACCHAROMYCES. 381 



value. Experiments made in this direction, however, have 

 hitherto proved unsuccessful. 



Lepeschkin often found mycelial formations in young 

 cultures of S. Pombe. This formation remained through 

 countless generations. He believes that the mycelium is not 

 to be regarded as a normal form of development, but only 

 occurs through the reconstruction of cells. The requisite- 

 conditions are unknown. 



In the rum-fermentation of molasses in the West Indian 

 Islands, two different yeast types occur. In a few districts 

 the common ellipsoidal form predominates ; in other districts 

 a mould-like Saccharomyces. In arrack-fermentation of mo- 

 lasses in Java Vordermann and Eykmann constantly found a 

 fungus which separates new cells through formation of partition- 

 walls ; no spore-formation was observed, and, according to 

 Eykmann, the fungus recalls Hyphomycetes in its growth 

 forms. A Saccharomyces of similar appearance was discovered 

 by P. Greg while working in the writer's laboratory in cane- 

 sugar molasses as used in rum-fermentation in Jamaica. This- 

 is designated : 



Schizosaccharomyces or Saccharomyces mellacei 

 Jorgensen. (Figs. 86 and 87.) 



In cylindrical vessels at 25 C. this species ferments beer- 

 wort with top-fermentation phenomena, forming a caseous, 

 loose deposit. During fermentation it develops a pleasant 

 aroma. In wort of 10-5 per cent. Ball, it produces about 

 2| per cent, by weight of alcohol. 



The different forms assumed by the species, recall Saccharo- 

 myces octosporus, Sacch. Pombe, etc. In old cultures very 

 curious cell-forms (Figs. 86, 87) occur, which also develop 

 during fermentation. In wort-cultures five months old no 

 film had developed ; only a yeast ring was observed. The 

 liquor is not decolourised by old cultures. 



The spores (Fig. 87) are oval. They occur in all cell- 

 forms, generally four to a cell ; they refract light strongly, 

 and, according to Holm, they are coloured blue by iodine. 



Guilliermond found that an ascus is produced with this- 



