284 University of California ruhlicutions in Botany [Vou7 



Ulva lobata (Kuctz.) comb. iiov. 



rhiicoscris lobata Kuetzing, Spec. Alg., 1849, ip. 477, Tab. Phyc, vol. 6, 



1856, p. 10, pi. 27. 

 riva fasciata f. lobata Setehell, in Collins, Holiion and Setehell, I'liyc 



Bor.-Anier. (Exsicc), no. 863; Collins, Green Alg. N. A., 1909, p. 216. 



Among the Ulvac of tlie Calif orniaii coast is one of moderate size 

 (up to 30 cm. or more long, and up to 15 cm. or more broad) which 

 is distinct in general appearance. It is attenuate at the crisped base, 

 broadening above and usually lobed or divided into several broad 

 divisions. The margins are either plane or slightly undulate. Like 

 U. expansa it is thicker iii the center with palisade-like cells (in 

 section) and thinner on the margins where the cells are nearly square 

 (in section). It bears a striking likeness in every way to Kuetzing's 

 figure (1856, pi. 27) of his Phycoseris lohata from Chili. We have, 

 therefore, referred it to his species with some doubt. 



Ulva lohata belongs to the same group of species as U. expansa, 

 but is generally firmer in substance, slightly thicker, never reaches a 

 great size, and is less deeply or conspicuously ruffled. It is well 

 represented by the specimens distributed in the Phycotheca Boreali- 

 Americana (under no. 863). 



The most typical plants are those of the central Californian coast 

 (San Francisco to Monterey). We have referred here, also, one plant 

 from southern California, but with some doubt. 



Ulva expansa (Setehell) comb. nov. 



Frond ample, pale green, orbicular or broadly elongated, margin 

 deeply ruffled ; frond 60-70/* thick in the middle, 38-45/* on the mar- 

 gins; cells, in section, vertically elongated in the middle of the frond 

 (up to 28-30/* long, 10-12/* wide), nearly square in the margins. 



Growing on rocks in the lower littoral belt. Puget Sound, Wash- 

 ington, to Mexico (La Paz). 



Ulva fasciata f. expansa Setehell, in Collins, Ilolden and Setehell, 

 Phyc. Bor.-Araer. (Exsicc), no. LXXVII ; Collins, Green Alg. N. A., 

 1009, p. 216. 



We find along the coast of central California a broad species of 

 Ulva, often also long, something like Ulva latissima in ai)pearance, 

 yet of a more vivid green color, thicker in the center of the frond and 

 with distinct, broad, ruffled margins. The cells of the thicker center 

 of the frond are distinctly palisade-like in section, while on the thinner 



