394 University of California Puhlications in Botany [Vol. 8 



Growing on rocks, shells and, at times, on other algae, in the lower 

 littoral or upper sublittoral belts. Alaska (Port Clarence, Kjellman ; 

 Prince William Sound, Yakutat Bay and Wrangell, Saunders) to west 

 coast of Whidbey Island, Washington, Gardner. 



Greville, Scot. Crypt. Flora, vol. 2, 1824, pi. 96. Sphacelaria race- 

 mosa var. arctica Saunders, Alg. Harriman Exp., 1901, p. 419 ; Setchell 

 and Gardner, Alg. N.W. Amer., 1903, p. 239. Sphacelaria arctica 

 Kjellman, Beringh. Algfl., 1889, p. 51. 



AVe have only the specimens from Whidbey Island to guide us as 

 to the occurrence of this species on our coast and these are scanty 

 with very few zoosporangia and covered by epiphytes of the Dermo- 

 carpa-type. The irregular (never pinnate) branching, the regular 

 divisions of the outer cells of the joints by a secondary transverse 

 partition as well as the irregularly racemose arrangement of the 

 sporangia indicate the position of the Whidbey Island specimen under 

 the species and not under the var. arctica (Kjellm.) Reinke. It may 

 be that the Alaska specimens belong to the var. arctica. The few 

 zoosporangia found in our specimens are small (as indicated in our 

 description) but are probably not well developed. The racemose 

 arrangement in our specimens is not so regular or luxuriant as that 

 shown in Greville 's figures (Joe. cit.). 



2. Sphacelaria brevicornis S. and G. (Orothog. mut.) 



Erect filaments 1-1.5 cm. high, sparselj" and strictly branched, 

 attached by small, penetrating filaments ; joints showing only primary 

 longitudinal partitions, 35/* diam. below, 22-30,/x near the tip ; hairs 

 arising near the tips composed of 6-8 cells ; zoosporangia and game- 

 tangia unknown; propagula stout, obovate, tricornute, about 120/i 

 long and about TOju, wide (below the rays), composed of a few large 

 cells and on 2-3-celled pedicels, rays ("horns") short, of 2-3 cells, 

 blunt, attenuate outwards. 



Growing on Sargassum polyacanthum f. americanum. La Paz, 

 Lower California. 



Sphacelaria hrevicorms Setchell and Gardner, Mar. Alg. Gulf of 

 Calif., 1924, p. 725, pi. 19, figs. 59, 60. 



;S'. hrevicornis is very close to S. cornuta Sauv. of New Caledonia, 

 but the propagula are provided with shorter horns from a more 

 robust basal portion. 



