434 



Involucral leaves 



Antheridium 



A TEXTBOOK OF THEORETICAL BOTANY 



Fig. 421. — Polytrichuni commune. Vertical 

 section of male head bearing antheridia. 



Neck 



Oo%phere 



Involucral leaf 



Paraphyses 



Fig. 422. — Polytrichum commune. Vertical section 

 of female head showing a mature archegonium. 



