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 
ULE, 
WM 
TLL 
Ypysieunum 
=i 
Fic. 19.—Spermatochnus paradoxrus. a, longitudinal section of a young 
stem; b, ditto of a mature stem; c, section through a node. Highly magnified. 
(After Reinke.) 
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. 
