546 



A TEXTBOOK OF THEORETICAL BOTANY 



-r- Archegonium 



zat cell 



Fig. 547. — Botrychium virginiamwi. Section of a pro- 

 thallus showing archegonia and mycorrhizal tissue. 



COVER CELL 



BODY CELL 



ANTHEROZOID 

 MOTHER CELLS 



OPERCULAR 

 CELL 



Fig. 548. — Botrychium virgimanutn. Development of the antheridium 

 from a superficial cell of the prothallus. {After Campbell.) 



