STRUCTURE OF YEAST PLANT 



129 



various substances, may appear in the surrounding 

 cytoplasm (Fig. 14, C). 

 Conditions of Life. — " Wild " yeasts are found in 



Fig. 14. — ^Yeast plant (Saccharomyces). A, yeast cells budding and 

 forming chains, x 200. c.w., cell wall; ppm., protoplasm; vac, 

 vacuole. B, two cells forming buds. The black granules are 

 volutin, a complex organic substance formed by the yeast cell. 



C, diagram of the structure of a yeast cell made up from informa- 

 tion about its structure obtained from treating and staining the 

 cell with various reagents ; n.v., nuclear vacuole ; nl., nucleolus ; 

 chr., chromatin; gl., glycogen (after Wager and Penistone). 



D, formation of four spores within a cell. 



exposed sugary secretions or exudations of plants, 

 for instance in the " nectar " of flowers, in the drops 



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