50 



SEAWEEDS 



oogonia developed in the usual manner and also others 

 borne laterally on branching filaments. As stated 

 above, the typical number of oospheres is eight in 

 each oogonium, but it is characteristic of different 



FIQ. 6. Sarcophycus potatorum. a, section of male conceptacle ; b, female 

 ditto, both highly magnified. (After F. G. Whitting, in Phyc. Mem.) 



genera to possess four, two, or only one, though in 

 the latter cases eight daughter-nuclei are formed 

 from the parent nucleus, the appropriate residuum 

 being rejected. The oogonia are usually more or 

 less egg-shaped, varying towards a globular form on 



