56 Allan Hancock Pacific Expeditions vol. 26 



arising from the large nodal cells; apices forcipate and much incurved; 

 cells of the axial filament 1.5-2.0 times as long as broad below, slightly 

 swollen at the end; corticating bands at the nodes wide, covering about 

 3/4 of each internode below, almost completely covering these in the 

 ultimate ramuli; corticating bands asymmetrical with respect to the 

 nodes, considerably more than half being below and composed of close- 

 fitting, approximately isodiametric cells forming about four fairly well- 

 defined whorls, while the upper part of the band is composed of cells 

 which elongate vertically and are without definite arrangement in 

 whorls; trichoblasts long, numerous, bulbose at the apices when young; 

 tetrasporangia immersed within the band, arising on all sides, 55-65 ja 

 in diam.; cystocarps and spermatangia unknown (after Setchell & 

 Gardner) . 



Type: H. L. Mason 82, April, in Herb. California Academy 

 of Sciences (173621). 



Type locality: Among other small algae, Guadalupe Island, 

 Mexico. 



Mexican distribution: Known only from the type. 



Ceramium fimbriatum Setch. & Gard. 

 PL 19, fig. 3; PL 20, fig. 6-7 



Setchell & Gardner 1924, p. 777, pi. 26, fig. 43-44; Setchell & Gardner 

 1937, p. 88, pi. 7, fig. 18; Dawson 1944, p. 317; Dawson 1950, p. 123; Dawson 

 1951, p. 54; Dawson 1959, p. 30. 



Thalli minute, partially creeping or entangled, to 1 cm. in extent, 

 the filaments 80-100 jx in diam., regularly dichotomous, corticated only 

 at the nodes, the lower, or prostrate parts provided with numerous 

 rhizoids from the nodes; cortical bands about 1/2 as long as wide, 

 divided by a clear line in the lower third into two parts, composed 

 of irregularly angular cells, provided with a whorl of short, thick, de- 

 ciduous or semi-permanent hairs 40-50 ju long, 20-25 ju in diam. ; in- 

 ternodes 25-30 /x long above, rapidly lengthening to 300-400 [x below; 

 apices forcipate; tetrasporangia spherical, 55-65 /a in diam., whorled 

 within swollen cortical involucres; sexual plants not known. 



Type: Marchant 87a, May, in Herb. University of California, 

 Berkeley. 



Type locality: Floating, Eureka, near La Paz, Baja California, 

 Mexico. 



Mexican distribution: Pacific Baja Calif. — Hollenberg 2571, 

 Punta Banda; D. 1407, Punta Santa Rosalia; Williams 4/24/46, 

 Laguna de Scammon; D. 10502, 12 mi. east of Punta Eugenio. Gulf 

 of Calif. — D. 202-40, Puerto Refugio, Isla Angel de la Guarda; D. 

 160-40, Isla Tiburon; D. 413a-40, Isla Pond; D. 753-40, Isla Turner; 

 D. 10987, Ensenada de San Francisco; D. 18765, Puerto Escondido; 



