NO. 10 DAWSON : MARINE ALGAE, GULF OF CALIFORNIA 315 



Griffithsia tenuis Ag. 



C. Agardh, 1828, p. 131 ; Collins & Hervey, 1917, p. 135, pi. VI, figs. 



38, 39; Kiitzing, Tab. Phyc. XII, tab. 31c-d; B0rgesen, 1915- 

 1920, p. 462, fig. 423; Okamura, Icones Jap. Algae VII, p. 2, 

 pi. 302, figs. 1-6, pi. 303, figs. 4-7. 

 We have several specimens at hand which, though sterile, undoubt- 

 edly belong to this widely distributed species. Their habit is very distinc- 

 tive and is well delineated by Okamura. The absence of dichotomous 

 branching and the irregularity in the length of the lateral branches are 

 sufficient to distinguish it. 



D. 145, from 4-32 meters, south of Tiburon Island, Jan.; D. & R. 

 2916, epiphytic on Sargassum, Kino, Nov.; D. 204, 289, from rock 

 pockets, lower littoral, Puerto Refugio, Jan. (dwarfed specimens) ; D. 

 169, in seine haul over sand just off south beach, Puerto Refugio, Jan.; 



D, 400, abundant on lower littoral rocks. Pond Island, Feb.; D. 345, 

 dredged in 22 meters, Punta Pefiasco, Feb. 



Grifi&thsia multiramosa (S. & G.) Taylor 



Taylor, 1939, p. 14, pi. 2. Neomonospora multiramosa Setch. & Gard., 

 1937, p. 87, pi. 4, fig. lOa-c. 



This species is amply described and illustrated in the recent paper of 

 Taylor. The specimens from which his description is drawn were 

 dredged in 12-20 meters over sandy bottom off Punta Gorda, Schmitt 

 13, July 19, 1938. Those of Setchell and Gardner were dredged in 40 

 meters near by at San Jose del Cabo, August. Additional collections of 

 this plant: D. 624, dredged in 34-50 meters off Gorda Point, Feb.; D. 

 231, trawled in 4 meters at low tide, south shore of Puerto Refugio, Jan.; 

 D. 245, cast up on shore, Puerto Refugio, Jan.; D. 270, dredged in 

 12-22 meters, Mejia channel, Puerto Refugio, Jan. 



This is the most slender species in our territory, the ultimate branch- 

 lets being only 15-20 /a diam., their cells 100-200 /a long. 



Genus GERAMIUM (Roth) Lyngbye 

 Ceramium sinicola S. & G. 



Setch. & Gard., 1924, p. 773, pi. 25, figs. 40, 41, pi. 75. Ceramium 

 bicorne S. & G., 1924, p. 773, pi. 28, fig. 64, pi. 74. 

 Fronds 1-2 cm. high, dichotomously branched, attached by a creeping 

 prostrate portion with rhizoids; the forcipate apices long, blunt, com- 



