160 University of Calif ornia Piihlications in Botany [Vol. 8 



The branching of Bryopsis elegans Menegh. figured by Zanardini 

 (1860-76, pi. 72) referred to by J. G. Agardh (1886, p. 28) as being 

 possibly of B. kypnoides is different in detail, at least, from all the 

 others. 



The specimens from the Pacific Coast, referred here until more 

 study and careful comparison with the type specimens can be made, 

 seem reasonably uniform. They are much branched plants, poly- 

 stichous, with less definite distinction between axes and with less 

 regular plumes than B. corticulans shows. The pinnules are compara- 

 tively long and slender, long attenuate at the apex, but suddenly con- 

 tracted to a broad, rounded base, and attached to the axis by a narrow 

 neck. The older pinnules are very symmetrically rounded at the base 

 and without any appearance of the production of rhizoidal outgrowths 

 above, but possessing stout, rather long and branched rhizoids at the 

 bases of the main branches (cf. M. A. Howe, 1914, p. 40, and Phyc. 

 Bor.-Amer., no. 1028). The Pacific Coast plants referred here vary 

 somewhat in coarseness and may ultimately be found to belong to 

 more than one species. 



3. Bryopsis corticulans Setchell 



Plate 15, figs. 4, 5, and plat© 27 



Thallus rather stout and coarse, 8-14 cm. high, main stem 1 mm. 

 diam. ; dark green in the growing parts, glossy throughout ; main 

 stems not much divided, lower part naked, upper part, usually about 

 half of the whole length, with abundant, patent, generally opposite 

 branches constricted at the bases, naked below, above with rather 

 stout, distichous pinnules, decreasing in length towards the tip of the 

 branch and abruptly contracted at the unequal base ; general outline 

 of frond of individual branches pyramidal; conspicuous tufts of 

 coarse, descending, slightly branched, rhizoidal filaments found at 

 the bases of the branches and branchlets. 



Growing on rocks in the lower littoral belt, from Vancouver, Brit- 

 ish Columbia, to southern California. Observed at Vancouver Island, 

 British Columbia, Puget Sound, Washington, and also at Santa Cruz, 

 Pacific Grove, Carmel, and San Pedro in California. 



Setchell, in Collins, Holden and Setchell, Phyc. Bor.-Amer. 

 (Exsicc), 1899, no. 626; Collins, Green Alg. N. A., 1909, p. 404; 

 Setchell and Gardner, Alg. N.W. Amer., 1903, p. 230. Bryopsis 

 plumosa Tilden, Amer. Alg. (Exsicc), no. 371 (not of C. Agardh). 



