COKER-WlLSON : SCHIZOSACCHAROMYCES OCTOSPORUS 287 



20, 21). This shape may be variously modified as shown in the 

 figures. A dumbbell form is frequently seen. 



In a recent paper* Guilliermond gives a good review of our 

 present knowledge of spore formation, in the yeasts. Among 

 them sexuality is known to appear in two ways. In Schizosac- 

 charomyces, Zygosaccharomyces } and Debaryomyces, there is a 

 fusion of cells before spore formation. In Sac char omyces Lud- 

 wigii, Willia Saturnus, and yeast of Johannisberg II, there is no 

 fusion preceding the formation of spores, but the spores fuse dur- 

 ing the act of sprouting. In a number of other cases spores are 

 formed but there is no conjugation either before or after. 



Chapel Hill, N. C. 



Explanation of Plate 55 



Schizosaccharomyces octosporus Beyerinck 

 Figures 1— 11. Normal stages of vegetative growth and division. X 1080. 

 Figures 12, 13. Elongated forms showing the beginning of hyphal deve'op- 

 ment. X 1080. 



Figures 14-25. Stages in conjugation and spore formation. X 1080. 

 * Ann. Myc. 8: 287. 191 o. 



