248 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



americanu7n S. &; G , 1924, p. 736. Sargassum paniculatum of S. 

 & G., 1924, p. 740, 1925, p. 721, pi. 46, fig. 5. Sargassum calif or- 

 nicutn (Grun.) Setchell, 1937, p. 129. 



The type of Sargassum sinicola is a fragment of the upper reproduc- 

 tive part and shows only the special characters of that portion of the plant. 

 A study of entire and fragmentary plants of all Gulf collections has been 

 made to derive the above synonymy. Considering the very wide variation 

 included in this species-complex, no attempt is made here to reach a posi- 

 tive determination of the limits of the species and its varieties, but only to 

 discuss the variations and something of their significance. Thus it may be 

 possible to segregate examples of this complex species from examples of 

 the other, more sharply defined species of the region. 



With few exceptions, the proportionately long, narrow, dentate 

 leaves, with conspicuous cryptostomata, the smooth branches and vesicles, 

 together with the basal holdfast of short, coarse, branched, and knotted 

 rhizomes will distinguish this macrospecies. It is usually very much more 

 lax in habit than Sargassum Camouii. Vesicles may sometimes have a 

 small apicula (D. & R. 3141). Leaves may sometimes be large, broad, 

 and with inconspicuous cryptostomata (D. 135). 



D. 135, Turner's Island, Jan.; D. 738, July; D. 426, Pond Island, 

 Feb.; D. & R. 3355, 3354, 3141, Guaymas, Dec; M. 29, 30, 31, Aug.; 

 Mexia, 1945, Brand. 5, 3, 1 ; D. 676b, Kino, July; D. & R. 2927, Nov.; 

 J. 15, Concepcion Bay, June; M. 20, 26, 27, 11, 23, Eureka, May; Bry- 

 ant 6, La Paz; Brand. 37, 13, 27; D. 357, Punta Peiiasco, Feb.; Poin- 

 dexter, March. 



A peculiar form of this species with receptacles bearing both oogonial 

 and antheridial conceptacles has been collected twice at Punta Penasco, 

 Sonora (pi. 39, figs. 6, 7). 



Sargassum Camouii sp. nov. 

 Plate 35, Figs. 9, 11-13 



Frondes usque ad 6 dm. altae, axi primaria e disco solido parenchymatico aut 

 cono orientes; ramis primariis asperis; foliis 4-6 cm. longis, lineari-lanceolatis, 

 6-12-plo longioribus quam latis, costa percurrente, irregulariter dentatis, crypto- 

 stomatibus numerosis, parvis ; vesiculis sphericis, muticis, 3-4.5 mm. diam. 



Plants to at least 6 dm. high, from a solid parenchymatous disk or 

 cone-holdfast; stems rough, usually muricate, coarse and woody below; 

 leaves 4-6 cm. long, linear lanceolate, 6-12 times as long as broad, with 

 percurrent midrib, irregularly dentate, dark-colored, with numerous 

 small cryptostomata which are not conspicuous on dried specimens ; gen- 



