Sargassum sinicola

Sargassum sinicola Setchell et N. L. Gardner subsp. sinicola

Sargassum sinicola Setchell et N. L. Gardner, 1924a:736, pl. 20: fig. 73; Setchell and Gardner, 1925:718; Dawson, 1944:247, pl. 35: fig. 10, pl. 38: figs. 5–11, pl. 39: figs. 1–11; Dawson, 1959a:19; Dawson, 1961b:400; Dawson, 1966a:13; Norris, 1973:8; Huerta-Múzquiz, 1978:337; Stewart and Stewart, 1984:142; McCourt, 1984b:141; Huerta-Múzquiz and Mendoza-González, 1985:46; Mendoza-González and Mateo-Cid, 1985:26; Mendoza-González and Mateo-Cid, 1986:421; Ortega et al., 1987:77; Espinoza-Ávalos and Rodríguez-Garza, 1985:115, fig. 1; Espinoza-Ávalos and Rodríguez-Garza, 1987:183; Sánchez-Rodríguez et al., 1989:41; Espinoza-Ávalos and Rodríguez-Garza, 1989:141; Espinoza, 1990a:1; Rocha-Ramírez and Siqueiros-Beltrones, 1990:20 [in part]; Rocha-Ramírez and Siqueiros-Beltrones, 1991:26; Martínez-Lozano et al., 1991:23; Mateo-Cid et al., 1993:51; Phillips, 1995:118; González-González et al., 1996:163; Pacheco-Ruíz and Zertuche-González, 1996b:171; Riosmena-Rodríguez et al., 1998:45; Mateo-Cid et al., 2000a:68; Cruz-Ayala et al., 2001:190; L. Aguilar-Rosas et al., 2002:235; Mateo-Cid et al., 2006:50, 58; Pacheco-Ruíz et al., 2008:205; Rodríguez-Montesinos et al., 2008:33; Pedroche et al., 2008:100.

Sargassum polyacanthum f. americanum Setchell et N. L. Gardner, 1924a:736; Setchell and Gardner, 1925:718; González-González et al., 1996:162.

Algae up to 60 cm long; of smooth axes and branches above a short stipe, attached below by a knotty, coarse

holdfast with short, thick protuberances. Leaf-like blades, long and narrow, very variable in size, 30–60(–90) mm long and (2–)3–5 mm wide; with a midrib, inconspicuous cryptostomata, and irregularly dentate margins. Vesicles smooth, mostly spherical, up to 6 mm in diameter, with a pedicel, and sometimes with a small terminal apicula.

Receptacle branchlets forked up to 4 times, subcylindrical, smooth, with acuminate apices, and scattered among vesicles in upper portions of the thallus. Oogonial

receptacles generally shorter and more robust than the antheridial receptacles.

HABITAT. On rocks and tidal platforms; usually low intertidal to shallow subtidal, occasional in mid intertidal tide pools.

DISTRIBUTION. Gulf of California: Piedras de La Salina to Cabo San Lucas. Pacific coast: Isla Guadalupe; Baja California Sur.

TYPE LOCALITY. Eureka, near La Paz, Baja California Sur, Gulf of California.