244 
PHARMACEUTICAL BOTANY 
undergoes a resting stage and upon the advent of favorable condi¬ 
tions develops into a new Edocarpus filament. 
Fucus Vesiculosus (The Bladder Wrack). —This form, a brown 
alga, occurs as a flat thallus, which forks repeatedly, a type of 
T 
Fig. i 19. —Fucus vesiculosus. Receptacle cut transversely, c, conceptacle, 
T, cellular thickness. (Magnified.) 
branching called dichotomous. It grows near the surface of sea 
water, attached to rocks or to mussels along banks by means of a 
basal disc-shaped holdfast. In the upper branches of the thallus are 
Fig. 120 .—Fucus vesiculosus . Section of a male conceptacle lined with branched 
paraphyses which bear the antheridia (highly magnified). 
to be found air bladders which are more or less spherical and usually 
in pairs. The tips of old branches become swollen and are termed 
receptacles. They are dotted over with minute cavities called con - 
