im 



Fig. 13.— Details ot spoiulation and of spore germination by S. griseiis as shown 

 by electron microscope: Top, left, aerial sporogenous hypha showing septation 

 prior to spore formation; top, right, more ad\'anced stage in spore formation; bot- 

 tom, left, well matured, four-spored chain; center, spore germinated by a single 

 germ tube; bottom, right, spore germinated by two germ tubes Qfroni Carvajal, 

 64). Note (top, left) mitotic division taking place in developing spores. 



