224 



DIFFERENTIATION OF TISSUES, FUCUS 



antheridial hair enclosed in the inner wall of the 

 antheridium. 

 The bladders containing the eggs and sperms are 



Fig. 34. — ^A, branched hair from conceptacle of Fucus showing 

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

 by inner wall of antheridium, bursting g.nd setting free the sperms^ >i 

 (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 ha,irs which fill up most of the space within its 



