214 



A TEXTBOOK OF THEORETICAL BOTANY 



B 



\ 



I 



D 



k :^l^ ' «^ 



t 



^'i 





# 



Fig. 205. — Sapfolegtiia diclina. Development of oogonium. A, 

 Early stage, terminal swelling of hypha. B, Formation of basal 

 septum. C, Development of central vacuole. D, Mitosis in 

 peripheral protoplasm. E, Differentiation of oospheres. F, 

 Oospores. 



(From preparations by the late Professor Trow. ) 



