NO. 10 DAWSON : MARINE ALGAE, GULF OF CALIFORNIA 325 



D. & R. 3303, cast ashore, near Guaymas, Dec. ; D. 275, dredged in 

 12-22 meters, Meji'a channel, Puerto Refugio, Jan.; D. 228, dredged in 

 4 meters at low tide, Puerto Refugio, Jan. ; D. 475d, dredged in 30-36 

 meters, Ensenada de San Francisco, near Guaymas, Feb.; D. 504, 

 dredged in 16-28 meters, Puerto Escondido, Feb. 



This species is apparently exclusively sublittoral in the Gulf, judging 

 from all collections to date. Both cystocarpic and tetrasporic plants were 

 found in January. 



Genus JANTINELLA Kylin 

 Jantinella sinicola (S. & G.) Kylin 



Kylin, 1941, p. 40. Colacodasya sinicola Setch. & Gard., 1924, p. 770, 

 pi. 28, fig. 63. 

 Growing on Chondria acrorhizophora, M. 43a, Eureka, May. Not 

 again detected. 



Genus HETEROSIPHONIA Montagne 

 Heterosiphonia sinicola S. & G. 



Setch. & Gard., 1924, p. 770, pi. 28, figs. 59, 60, pi. 47b. 



Cast ashore. Eureka, M. 49, 65, May. Not again collected. 



Family Rhodomelaceae 



Genus CHONDRIA C. Agardh 

 Chondria calif ornica (Collins) Kylin 



Kylin, 1941, p. 41, pi. 12, fig. 35. Chondria tenuissima f. calif ornica, 

 Collins, Holden & Setchell, Phyc. Bor. Amer. no. 636. 



Specimens from one shore station show exceedingly close resemblance 

 in color, size, and branching with the specimens distributed in the P.B.A. 

 from La Jolla, California. Collins says, "very iridescent when growing," 

 a conspicuous character which the Gulf plants possess. 



The deep-water examples here listed are apparently of this species, 

 to judge from form and branching, though the iridescence has not been 

 observed. 



D. 101, lower littoral rocky shore, north side of Turner's Island, 

 Jan.; D. 146, dredged in 4-32 meters off south end of Tiburon Island; 

 D. 255, dredged in 12-22 meters, Mejia channel, Puerto Refugio, Jan. 



Chondria dasyphylla (Woodw.) C. Ag. 



C. Agardh, 1822, p. 350; B0rgesen, 1918, p. 258, figs. 151, 152. 



Several specimens of both winter and summer collections seem better 



