130 



MICRO-ORGANISMS AND FERMENTATION. 



from the previous type in that they are not yeast cells, but 

 mycelium-like growths, promycelium. The development 

 of yeast cells takes place from this promycelium, a sharp 



FIG. 30. 



Saccharomyces Ludwigii, after Hansen. Germinating spores from old gypsum 

 block cultures. At a and b each spore has developed a germ-filament ; at 

 c are shown different forms produced by fusion. 



partition wall being first formed ; the cell then becomes 

 detached, and finally its ends become rounded. At the ends 

 of these cells buds are developed, and these also become 

 detached at the partition walls. 



FIG. 31. 

 Germination of spores of Saccharomyces anomalus, after Hansen. 



In the case of older spores this curious fusion is more 

 uncommon (Fig. 30). Some germ-filaments develop into a 

 branched mycelium (group 6). 



The third type, which occurs in Saccharomyces anomalus 



