382 



A TEXTBOOK OF THEORETICAL BOTANY 



SHIELDS 



FILAMENTS 



MANUBRIUM 



SHIELD 



SECONDARY 

 CAPITULA 



MANUBRIUM 



Fig. 365. — Structure of the antheridium. Chora hispida. A, Mature antheridium. Chara 

 tomentoso. B, Shield with manubrium and filaments attached. C, Head of manubrium 

 showing capitulum and sporogenous filaments. {After Prosper). Chara sp. D to F, 

 Development of the antherozoid from a cell of a spermatogenous filament. {After 

 Gujf^nord.) {From Grove and Bullock Webster.) 



cavity. The result is the formation of a rod-shaped cell, termed the 

 manubrium. One end is attached to the centre of the shield, while at 

 the other is the innermost cell of the series, which now divides and forms 

 the capitulum (Fig. 366). 



Each capitulum now buds off a group of about four to six cells, which 

 are termed the secondary capitula. Each secondary capitulum cuts off 



