PHAOPHYCEE 41 
Fic, 2.—a, Plant of Fucus vesiculosus, with air vesicles and fertile tips of 
frond reduced; b, male conceptacle of F. serratus; c, female conceptacle ; 
d, antheridia ; e, oogonium emerging from outer membrane ; f, oosphere, with 
antherozoids. 0, ¢, d, e, and f highly magnified. (After Thuret and Bornet.) 
