1925] Setchell-Gardner : Melanophyceae 721 



apiculate, 1-2 mm. diam., on pedicels as l()n<i- as or longer tiian the 

 diara. ; receptacles short, 5-10 mm. long, siibcylindrical, acuminate, 

 only sparsely branched, tuberciilate with conspicuous conceptacles ; 

 plants very dark on drying. 



Growing in the upper sublittoral belt. Georges Island, Gulf of 

 California. 



Setchell and Gardner, Mar. Alg. Gulf Calif., 1924, p. 739, pi. 20, 

 figs. 69-71. 



17. Sargassum paniculatum J. Ag. 



Plate 46, fig. 5 



Basal parts unknown ; main branches and branchlets relatively 

 slender, terete, smooth ; secondary branches arising near the middle 

 of the primary branches, longest below, gradually diminishing upward, 

 the fructiferous ramuli arising on the base of the leaves of the 

 secondary branches ; leaves linear-lanceolate, acute, midrib percurrent, 

 margins acutely denticulate-serrate, in part doubly so, cryptostomata 

 scattered, or in a fairly regular row on each side of the midrib, incon- 

 spicuous; vesicles subspherical to ovate 2-4 mm. long, smooth, on 

 pedicels as long as or longer than the diameter, occupying positions of 

 leaves at the base of the fructiferous ramuli or scattered among the 

 receptacles ; receptacles cylindrical, acuminate, more or less branched, 

 forming loose racemes. 



Guadalupe Island, off the coast of Mexico. 



J.Agardh, Sp. Alg., vol. 1, 1848, p. 315, Sp. Sargass. Aust., 1889, 

 p. 122, pi. 12, figs. 1-3 ; Grunow, Add. cog. Sargass., 1916, p. 177. 



We are including this species in our account, based upon a portion 

 of a frond collected by Dr. E. Palmer at Guadalupe Island, Lower 

 California, Mexico, communicated to the Herbarium of the University 

 of California (no. 170615) by Dr. W. G. Farlow, and are placing it in 

 8. paniculatum on the authority of Th. Reinbold. who examined the 

 specimen. The plant agrees fairly well with the descriptions and 

 figures of J. Agardh {loc. cit.). 



We have no knowledge of the "Sargassum fuJigmosum var. (?) 

 Calif ornica" described by Grunow, 1916, p. 173. "Hab. ad littora 

 Californiae (leg. Askenasy)," and hence are not including it in our 

 flora until we obtain further information concerning its structure 

 and distribution. 



