PHAOPHYCEA 71 
Fia. 11.—Splachnidium rugosum Grey. a, plant reduced one-half. 6, sec- 
tion through apex, showing apical cell. ce, section through young conceptacle. 
d, conceptacle with sporangia. e, section through branch. f, early stages in 
the development conceptacles, showing four initial cells. g, farther stage in 
development of conceptacle. h, transverse section of thallus. b> to h much 
magnified. (After M. O. Mitchell and F, G, Whitting, in Phyc. Mem.) 
