88 



SEAWEEDS 



the enveloping mantle of filaments is given off in 

 whorls and surrounds the central axial strand. This 

 mantle, ultimately several cells thick, takes on a 



FIG. 19. Spermatoclmus paradoxus. a, longitudinal section of a young 

 stem ; 5, ditto of a mature stein ; c, section through a node. Highly magnified. 

 (After Keinke.) 



parenchymatous form and gradually becomes detached 

 from the axial row, except at the insertions of the 

 whorls, and an intercellular space intervenes from 

 whorl to whorl between the axial row and the mantle. 



