Ostiole 



Wall of 

 thallus 



Paraphyses 

 Oogonium 



Oosphere 



Wall of 

 conceptacle 



0m, 



Fig. 128. — Fucm senatus. Transverse section of a female conceptacle 

 showing development of oogonia. 





■ Ostiole 



<-^\- 



//' 







Jm 



- -V 





' < ' " t ' \ 



f V' 



\^ 



Antheridia 







Mir 



Conceptacle 

 wall 



Fig. 1 29. — Fucus senotus. Transverse section of a male conceptacle 

 showing antheridia on branched filaments. 



141 



