28 



duction the forked tips are swollen and highly mucilaginous 

 because of the presence of the reproductive tissues. 



The color of the thallus is greenish-brown because of the 

 presence of a brown pigment and chlorophyll. 



FIG. 5. Phceophycece. Fucus vesiculosus. The upper left figure is a 

 cross-section of a male or anteridia-bearing conceptacle, and right, an anther- 

 idial hair with five antheridia filled with sperms. Lower left, a female or 

 oogonia-bearing conceptacle with numerous oogonia, each with eight 

 oospheres, all of which do not show in section. 



Histology. The outer surface of the thallus is composed 

 of a single layer of palisade cells with yellowish-brown con- 



