148 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



PLATE 21 



(all after Setchell & Gardner) 



Fig. 1. Ceramium howellii S. & G. A small lower part of an axis with a 

 tetrasporangial branchlet, X 100. 



Fig. 2-3. Ceramium gracillimum var. byssoideum (Harv.) Feldm.-Maz. Fig. 

 2, Two mature tetrasporangial nodes, X 165; Fig. 3, A sterile axis, 

 X 165. 



Fig. 4-5. Ceramium evermannii S. & G. Parts of sterile and tetrasporangial 

 axis, respectively, X 82. 



