152 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



PLATE 23 



Fig. 1-2. Cer annum mazatlanense Daws. Fig. 1, A young tetrasporangial 

 plant with abaxial sporangia, X 100; Fig. 2, Sterile nodes, X 200. 



Fig. 3. Ceramium pacificurn (Collins) Kylin. A young sterile node, X 190. 



Fig. 4. Ceramium horridum S. & G. Upper part of a plant (X 36) and 

 two apices to show spines (X 100) (after S. & G.). 



Fig. 5-7. Ceramium paniculatum Okani. (after Okamura) Fig. 5, Apex to 

 show multicellular spines, X 120; Fig. 6, A tetrasporangial node, X 

 175; Fig. 7, Part of a cystocarpic plant, X 64. 



