388 University of California Puhlications in Botany [Vol.6 



There have been three other species of Sargassum detected in 

 the waters of the Pacific Ocean on the coast of the United States and 

 Mexico, viz. >S'. Agardhianiim Farlow, S. Lichmanni J. Ag., and S. 

 paniculatum J. Ag. S. Agardhiunum is the best known of these. 

 It was named b}" Farlow in 1876 (p. 706) based upon material col- 

 lected at San Diego, California. The description was first published 

 in J. Agardh's Species Sargassorum Australi-ae (1889, p. 93). It has 

 been distributed in Farlow, Anderson and Eaton's Alg. Exsicc. Amer.- 

 Bor., no. 103, in Collins, Holden and Setchell's Phyc. Bor.-Amer. 

 {Exsicc), nos. 179 and CXVIII, and in Hauck and Richter's Phyko- 

 theka Universalis {Exsicc), no. 667. Its geographical distribution, 

 as at present known, extends from the vicinity of Los Angeles to 

 Point Loma, southern California, and the adjacent islands. S. Lieh- 

 manni was first collected on the west coast of Mexico by Liebmann 

 and specimens finally came into the hands of J. G. Agardh, who pub- 

 lished it (1847, p. 8). We have no further record of its occurrence 

 elsewhere. There is a single fragment of S. paniculatum J. Ag. 

 collected by E. Palmer on Guadalupe Island off the coast of Mexico, 

 and contributed by Professor W. G. Farlow to the herbarium of the 

 University of California under herbarium number 170615. The de- 

 termination rests upon the authority of Th. Reinbold. This species 

 seems quite limited in distribution in our waters, Guadalupe Island 

 being the only locality in which it is known to occur. T. S. Brande- 

 gee collected specimens of a form on the coast of Lower California 

 which resembles 8. paniculatum quite closely and should probably be 

 referred to that species. Howe (1911, p. 496) mentions fragments of 

 two species of Sargassum collected by G. J. Vives at La Paz, Mexico, 

 but they were too fragmentary for identification with certainty. 



Cystoseira neglecta Setchell et Gardner sp. nov. 



Plates 35-36 



Dilute fusca, siccitate atra, 4—7 dm. longa, stipite e radice irregu- 

 lariter conica et fibrosa, flexibili, parce dichotoma, 5-15 cm. longa, 4-6 

 mm. diam., in sectione transversali triangulari, superne in ramis com- 

 planatis alternatim sub puncto vegetationis apicali positis producente ; 

 ramis complanatis coriaceis, flexibilibus, siccitate rigidis fragilibusque 

 post fructificationem deciduis et cicatrices angulares persistentesque 

 in stipite efficientibus, juvenis in lobis rotundatis alternisque sinubus 

 rotundatis divisis, lobis mediis infernisque 2-3 pinnatifidis, supernis 

 in ramulis cyliiidricis cum receptaculis numerosis terminalibus repetite 

 divisis; vesculis aeriferis in ramis supernis cylindricis positis, soli- 

 tariis aut paucis in seriebus, sed 1-3 mm. distantibus, sphaericis, 

 levibus, 2-3 mm. diam. 



