NO. 1 DAWSON: MARINE RED ALGAE OF PACIFIC MEXICO 65 



Type : Ivan M. Johnston 67b, April, in Herb. California Academy 

 of Sciences (1366). An isotype slide is in Herb. A. Hancock Foundation. 



Type locality: Ensenada Bay (Todos Santos Bay at Ensenada), 

 Pacific Baja California. Note: This plant was originally named "sini- 

 cola" because of the mistaken supposition that "Ensenada Bay" was in 

 the Gulf of California. 



Mexican distribution: Pacific Baja Calif. — D. 246, Punta Des- 

 canso; D. 1161, Punta Baja; D. 2953, Desembarcadero de Miller; D. 

 10388, 10461, vicinity of Punta San Eugenio; D. 16155 (Limbaugh) 

 Rocas Alijos; D. 6707, Isla Magdalena; D. 6902, Cabeza Ballena. 

 Revillagigedo Arch. — D. 4/17/55, Isla San Benedicto. Gulf of Calif. — 

 Common on various hosts, commonly Codium. Many records from Bahia 

 Tepoca to La Paz; D. 10946, Bahia Topolobampo. 



Ceramium sinicola var. interruptum (Setch. & Gard.) Daws. 



PI. 27, fig. 8 

 Dawson 1944, p. 316; Dawson 1950, p. 119; Dawson 1959, p. 30. Ceramium 

 interruptum Setchell & Gardner 1924, p. 775, pi. 26, fig. 47. 



Like the type of the species, but the generally continuous cortica- 

 tion of upper parts conspicuously interrupted by internodal spaces at the 

 dichotomies. 



Type: Marchant 78, May, in Herb. University of California, 

 Berkeley. An isotype slide in Herb. A. Hancock Foundation. 



Type locality: Epiphytic on other algae, Eureka, near La Paz, 

 Baja California. 



Mexican distribution: Same as the species. 



Ceramium sinicola var. johnstonii (Setch & Gard.) Daws. 

 Dawson 1944, p. 316; Dawson 1950, p. 119. Ceramium johnstonii Setchell 

 & Gardner 1924, p. 774, pi. 76, 77 . 



Like the type of the species, but the cortication continuous through- 

 out the plant except in extreme basal parts. 



Type: Ivan M. Johnston 104, April, in Herb. California Academy 

 of Sciences. 



Type locality: Isla San Pedro Martir, Gulf of California. 



Mexican distribution: Same as the species. 



Ceramium taylorii Daws. 



PL 26, fig. 1-3 

 Dawson 1950, p. 127, pi. 2, fig. 13, pi. 4, fig. 31-33; Dawson 1954a, p. 6; 

 Dawson 1959, p. 30, Ceramium fastigiatum prox. as interpreted by Taylor 1945, 

 p. 271. 



Thalli epiphytic or saxicolous, arising from prostrate filaments 

 adhering by rhizoids from the ventral nodal surfaces, the erect parts to 

 5 (or to 16) mm. high, 60-80 fx in diam. above, to 180 /x in diam. below, 

 apparently alternately branched; tips non-forcipate, divergent or some- 



