CYTOLOGICAL CHANGES DURING GERMINATION 



89 



Fig. 4. Electron micrographs of shadowcast spores showing the marked 

 differences in size. Magnification is the same in each; marker = 1 micron, 

 a. B. cereus. 

 h. B. cereus var. sotto. 



c. B. cereus var. thuringiensis. 



d. B. cereus var. alesti. 



