NO. 1 DAWSON : MARINE RED ALGAE OF PACIFIC MEXICO 147 



fornia it usually inhabits areas of maximum intertidal insolation or high 

 tide pools subject to considerable heating. It is notably lacking from all 

 collections within the upwelling areas north of Bahia Vizcaino. In the 

 Gulf of California it is a widespread intertidal species. Along the tropi- 

 cal mainland coast it apparently does not occur although it has been 

 dredged at Islas Tres Marias. Taylor's Guerrero collection cited in 1945 

 as A. peninsularis is not this species but is a good topotype specimen of 

 Amphiroa mexicana Taylor. 



Taylor had already in 1945 attributed a wide eastern Pacific distri- 

 bution to his Amphiroa peninsularis, and this now appears to be justified. 

 He seems to have overlooked, however, the great similarity between 

 these Pacific American plants and Amphiroa zonata Yendo of Japan. 

 This Japanese plant, as represented by Yendo's figures, shows such close 

 identity with the American specimens in size, external form and branch- 

 ing, and in internal structure that it is best considered conspecific. Por- 

 tions of two collections from Shirahama, Boshu, Japan in the Yendo 

 herbarium have also been examined and show no appreciable differences 

 from California and Mexican specimens. 



The following list serves to outline the known distribution of this 

 species along the American coasts: California — D. 5714, Santa Catalina 

 Island, Dec; D. 9598, Corona del Mar, Jan.; Cooper 151, Laguna 

 Beach, Nov.; D. 6039, Cardif, Jan.; D. 318, La Jolla, Jan.; Hubbs 

 46-123, Point Loma, Nov. Pacific Baja Calif .—Rxxhhs 48-217 (Aug.),. 

 D. 4269, 4247 (June), Hubbs 46-125 (Nov.), Islas Los Coronados; 

 D. 8367, Isla Guadalupe, Dec; D. 1463, Punta Santa Rosalia, Apr.; 

 D. 1386, Millers Landing, Apr.; D. 6555, Mar., D. 9864, April, South 

 Bay, Isla Cedros; D. 10087, 10331, 11 miles west of Punta Malarrimo, 

 Apr., Nov.; D. 10401, Punta San Eugenio, Nov.; D. 6584, Bahia Tor- 

 tuga. Mar.; D. 9178, Bahia Asuncion, Apr.; D. 9456, Punta Abreojos, 

 Apr.; D. 6689 (Mar.), D. 9296 (May), Isla Magdalena; D. 6635, 

 Bahia Magdalena, Mar. Gulf of Calif.— D. 222-40, Puerto Refugio, 

 Isla Angel de la Guarda, Jan.; Hancock Sta. 724-37, Punta Lobos, 

 Mar.; D. 108-40, Isla Turner, Jan.; D. 7112, Bahia Concepcion, Mar.; 

 D. 5827 (Mar.), D. 72-40, 48-40 (Jan.), D. 1752 (Apr.), D. 3555, 

 3578 (Nov.), vicinity of Guaymas; D. 7139, Bahia Agua Verde, Mar.; 

 D. 7054, Isla Carmen, Mar. Nayarit—Tsiylor 39-642a, Isla Maria 

 Magdalena, May. Ecuador — Taylor 34-483, Bahia San Francisco, Feb. ; 

 Schmitt 12E-33, La Libertad, Jan. Galapagos Archip. — Hancock Sta., 

 2 miles south of Tagus Cove, Albemarle Island, Dec 



