212 SEAWEEDS 
Fic. 64.—a, young plant of Choreocolax Polysiphonic (dark cells) penetrating 
host at angle formed by branches; b, cystocarp of same in section ; ¢, tetra- 
spores of the same (after Richards) ; d, Choreocolax albus with tetraspores ; the 
dark cells, except the tetraspores, are those of the host. Highly magnified. 
(After Kuckuck.) 
