SACCHAROMYCES I2Q 



MORPHOLOGY OF THE BLASTOMYCETES. 



The tlastomycetes are composed of spherical or ova 

 cells (8 to 9.5 fi in diameter), which, when rapidly 

 multiplying by budding, may form a spurious mycelium. 

 A thin cell-wall encloses the granular protoplasm, in 

 which vacuoles and sometimes a nucleus may be 

 noted. This latter is best seen when stained with 

 hsematoxylin (see page, 105). 



During their growth and multiplication the blasto- 

 mycetes split up solutions containing sugar into alcohol 

 and CO 2 . 



Saccharomyces (Fig. 81). Note the round or oval 

 cells of granular protoplasm (a) containing solid par- 

 ticles and vacuoles (c), and surrounded by a definite 

 envelope. 



Reproduction. Budding ; ascospores asexual. 



Note the asexual reproduction. 



i. "Gemmation" that is, the budding out of 

 daughter cells (6) from various parts of the gradually 

 enlarging mother cell. These are eventually cast off 



FIG. Si. Saccharomyces with ascospores. FIG. 82. Torula. 



and in turn become mother cells and form fresh groups 

 of buds. 



2. Spore formation "ascospores" (e). These are 

 formed at definite temperatures and within well-de- 

 fined periods; e. g., Saccharomyces cerevisise, thirty 

 hours at 25 to 37 C., or ten days at 12 C. 



