54 Allan Hancock Pacific Expeditions vol. 26 



Isla Cedros; Wiliams 4/30/46, Laguna de Scammon; D. 16185a 

 (Limbaugh), Rocas Alijos; D. 13382, Bahia de Santa Maria, Isla 

 Magdalena. Gulf of Calif.— D. 679, Puerto Liberated; D. 850, Isla 

 Jorge; D. 745, Isla Patos; D. 1018a, Isla Partida; D. 612a, Ensenada 

 de San Francisco; D. 7028, Isla Espiritu Santo; D. 6800, Cabeza 

 Ballena near San Lucas; D. 10964, 10944, 10909. Bahia Topolobampo. 

 Nayarit—D. 3696, Mira Mar. Oaxaca—D. 10764, 10767, Salina Cruz. 



Ceramium codicola J. Ag. 



PI. 19, fig. 5-6, PI. 20, fig. 5 

 J. Agardh 1894, p. 23; Dawson 1950, p. 117, pi. 1, fig. 6. Ceramium 

 codiophila Setchell & Gardner 1937, p. 89, pi. 8, fig. 23-24; Dawson 1944, p. 318 

 (in part); Dawson 1945a, p. 25; Dawson 1951, p. 53. 



Thalli epiphytic on Codium, usually 1.0-2.4 cm. tall, consisting of 

 a tuft of irregularly dichotomous axes from a basal mass of penetrating, 

 pigmented rhizoids with inflated, bulbous tips; axes completely corti- 

 cated, with inconspicuous differentiation of cortication tissue between 

 nodal and internodal portions, the axial diameters tending to be greatest 

 in mid-parts, the tips somewhat forcipate; short proliferous branchlets 

 often frequent; tetrasporangia completely embedded in more or less 

 swollen fertile axes, scattered or whorled, spherical, 35-40 f± in diam.; 

 cystocarps borne at the last two or three dichotomies of branches, 

 surrounded by involucral branchlets; spermatangia not seen. 



Type: Not designated, but probably an Anderson collection in 

 the Agardh Herbarium, Lund, Sweden. 



Type locality: Santa Cruz, California. 



Mexican distribution: Pacific Baja Calif. — D. 8130, H. W. 

 Clark 229 (type of C. codiophila), Isla Guadalupe; D. 8864, Punta 

 Baja; D. 2838, Punta Santa Rosalia; D. 10508, Punta Norte, Isla 

 Cedros; Howell 20b, Bahia San Bartolome; D. 9083, Islas San Benito. 



Ceramium eatonianum (Fail.) De Toni 



PI. 19, fig. 1-2 



De Toni 1903, p. 1493; Dawson 1950, p. 117; Dawson 1945. p. 62-67; Taylor, 



1945, p. 271; Dawson 1949, p. 223; Dawson 1950b, p. 68; Dawson 1951, p. 53. 



Centroceras eatonianum Farlow 1875, p. 373. 



Thalli 1-4 (10) cm. tall, purplish-black, dichotomously branched 

 but appearing as if distichously pinnate, the branches ± divergent at 

 angles of 20-40°, acute, non-forcipate, without short proliferous branch- 

 lets; axes completely corticated, somewhat constricted at the nodes, the 

 internodal corticating cells tending to be in vertical rows; nodal portion 

 of corticating tissue with gland cells; tetrasporangia completely im- 

 mersed in the cortex; cystocarps lateral, subhemispherical, 350-550 

 fi diam., without involucral branches (modified from Smith). 



Type: Evidently represented by a collection by E. Hall in the 

 Farlow Herbarium, Harvard University. 



