718 University of California Publications in Botany [Vol.8 



11. Sargassum Brandegeei S. and G. 



Basal parts unknown ; branches and branchlets terete, smooth, 

 without cryptostomata ; branching rather dense in the upper parts; 

 leaves 15-25 mm. long, 4-8 mm. wide, apices blunt, base cuneate, 

 margins deeply serrate, cryptostomata absent ; vesicles spherical, small, 

 2-3 mm. diam., smooth, apiculate or crowned by a rudiment of a leaf, 

 supported by pedicels mostly shorter than their diameter, occupying 

 positions of leaves toward the base of the ramuli, or scattered among 

 the receptacles ; receptacles in short dense racemes, with short distinct 

 pedicels below but with sessile branches above, mostly blunt. 



Cast ashore, Guaymas (?), Mexico. 



Setchell and Gardner, Mar. Alg. Gulf Calif., 1924, p. 736, pi. 21, 

 fig. 79. 



12. Sargassum sinicola S. and G. 



Basal parts unknown ; branches and branchlets smooth, terete ; 

 leaves linear-lanceolate, acute, margins serrate-dentate, midrib per- 

 current, cryptostomata sparse, inconspicuous ; vesicles numerous, 

 mostly borne near the base of pedicel supporting the receptacles, 

 spherical, smooth, 3-5 mm. diam., pedicels equaling the diameter ; 

 receptacles 1-3 times forked, the lower pedicellate, the upper sessile, 

 cylindrical, with acuminate apices, not spinose. 



Cast ashore, Eureka, near La Paz, Lower California. 



Setchell and Gardner, Mar. Alg. Gulf Calif., 1924, p. 736, pi. 20, 

 fig. 73. 



This species seems nearly related to 8. podocanthum Sond. and to 

 8. spinuligerum Sond. but the leaves are much more "glandular" and 

 the receptacles much more branched. 



13. Sargassum polyacanthum f. americanum S. and G. 



Basal parts unknown ; branches and branchlets up to 1.5 mm. diam., 

 moderately muricate, leaves 3-4 cm. long, narrowly lanceolate, acute, 

 margins serrate-dentate, midrib percurrent, cryptostomata sparse ; 

 vesicles spherical, smooth, up to 8 mm. diam., occupying positions of 

 leaves along the ramuli or at times supported by a leaf; receptacles 

 1-2 times forked, 2.5-4 mm. long, obtuse-conical. 



Cast ashore, La Paz ( ?), Lower California. 



Setchell and Gardner, Mar. Alg. Gulf Calif., 1924, p. 736. 



