334 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



tendency to these broadened parts of the branches. The general char- 

 acters of the cellular structure are shown in Plate 48, Figs. 7-10. 



Genus HERPOSIPHONIA Naegeli 



Herposiphonia subdisticha Okamura 



Plate 49, Fig. 2 



Okamura, Icones Jap. Alg. Ill, p. 199, pi. 146, figs. 11-18. 



Two collections of a very distinctive Herposiphonia have been found 

 to agree veiy completely with the Japanese species H. disticha. The 

 "langtriebe" alternate regularly after every third "kurztriebe." This, 

 together with the outstanding habit shown in the illustrations, distin- 

 guishes it from any other plant on our coasts. 



D. 443a, 457, on Grateloupia, growing on rocky, lower littoral shore, 

 San Esteban Island, Feb. 



Herposiphonia tenella (C. Ag.) Naeg. 

 Plate 49, Fig. 1 



Naegeli, 1846, tab. VIII, fig. 2; B0rgesen, 1915-20, p. 286, figs. 287, 288; 

 p. 472, fig. 430. 



Several sterile specimens of Herposiphonia are on hand which agree 

 essentially with the above species. B0rgesen's account of H. tenella and 

 H. secunda emphasizes the importance of fertile material, especially an- 

 theridial, and, in view of our lack of it, it is best to place all of these 

 closely related specimens under this name by which they can readily be 

 recognized. 



D. 135, on Sargassum, Turner's Island, Jan.; D. 458, San Esteban 

 Island, Feb.; D. 543c, on Wurdemannia, Agua Verde Bay, Feb.; D. 

 546b, on Dicranema, Agua Verde Bay, Feb.; D. 602a, on other small 

 algae, San Gabriel Bay, Feb. ; D. 656, scraped from middle littoral rocks, 

 near Kino, July; D. 709, 751, lower littoral rocky shore. Turner's Island, 



July. 



Genus PTEROSIPHONIA Falkenberg 

 Pterosiphonia pennata (Roth) Falk. 



Falkenberg, 1901, p. 263, tab. 2, figs. 1, 2. Polysiphonia pennata Kiitzing, 



Tab. Phyc. XIII, tab. 23e-f. 



A few small specimens have been compared with both European and 



Californian specimens of this widespread species and found to agree in 



all essential details. None of those examined compare well with Kylin's 



