224 DIFFERENTIATION OF TISSUES. FUCUS 



antheridial hair enclosed in the inner wall of the 

 antheridium. 



The bladders containing the eggs and sperms are 



D 



FIG. 34. A, branched hair from conceptacle of Fucus showing 

 antheridia (a) and " sterile " cells (st.). B, bladder, formed 

 by inner wall of antheridium, bursting and setting free the sperms 

 (male gametes). C and D, stages in development of antheridium. 

 E, free male gamete with two flagella]; n, nucleus ; ph., phaeoplast. 



forced through the pore forming the mouth of the 

 conceptacle by the pressure of the swollen walls of 

 the hairs which fill up most of the space within its 



