164 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



PLATE 29 



Fig. 1 . Griff ithsia ovalis Harv. a-c, Parts of a sterile and two tetrasporangial 

 branches showing involucral cells, X 30, 16, 26, respectively; d, A 

 pedicellate tetrasporagium, X 300 (all after Abbott). 



Fig. 2. Griffithsia pacifica Kylin, part of a rhizoid-bearing form of the 

 species, X 1 3. 



Fig. 3-4. Ceramium personatum S. & G. A younger ( 3) and an older (4) 

 node showing development of descending corticating rhizoidal fila- 

 ments, X 330. 



