1 12 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



PLATE 18 



Fig. 1-2. Ceramium camouii Daws. Fig. 1, An open, much-expanded tetra- 

 sporangial involucre from the type collection, X 300; Fig. 2, tip 

 of a sterile axis from the type collection, X 200. 



Fig. 3-4. Ceramium caudatum S. & G. Fig. 3, Young nodes of a sterile fila- 

 ment, X 250; Fig. 4, Older nodes of same filament, X 350. 



Fig. 5-6. Ceramium clarionense S. & G. Terminal part of a sterile filament 

 showing nodal bands and gland cells, X 81; Fig. 6, Upper part of a 

 tetrasporangial plant, the cells not shown, X 55. 



