Fig 32. Transmission electronmicrograph of an immature NMB 

 spore. The spore wall has not yet developed. 

 N=nuclei; Pf=polar filament. X 12,000. 



Fig 33. Transmission electronmicrograph of two immature 



MB spores within a delicate pansporoblast membrane. 

 The surface sculpture is already prominent, although 

 the endospore is not yet fully developed. PM=pan- 

 sporoblast membrane. X 9,000. 



