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 
aH 
ii 
| cn 
SEE il fi 
x a 
Fic. 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 
