vol. i! Setchell— Gardner. — AJgce of Northwestern America. 339 



Callithamnion Baileyi Harvey. 



Ona wooden float, etc. West coastof Whidbey Island, Wash., 

 X.L.G.. No. 221!: Friday Harbor, San Juan Island, Wash., 

 X.L.G.. Xo. 504! 



The plants seem to agree in all respects with all the figures, 

 descriptions, and published specimens of this species. They 

 are to be distinguished from the last two by the tapering 

 mucronate tips of the branchlets. The branchlets have elongated 

 cells, thus differing from G. tetragonum (Withering) Agardh. 

 Our specimens possess tetrasporangia. 



Ceratothamnion Pikeanum f . laxum Setchell and Gardner 

 f. nov. 



On vertical rocks exposed to the force of the waves, often 

 under a covering of overhanging Fucus, in the literal zone. 

 Shumagin Islands. Alaska, Saunders (1901, p. 439, under the 

 species) ; Harvester Island, Uyak Bay, Kadiak Island, Alaska, 

 W.A.S. and A.A.L.. Xo. 5127!, and in Collins, Holden and 

 Setchell, P. B.-A.. Xo. 943!; Takutat Bay and Sitka, Alaska, 

 Saunders (1901, p. 439, under the species); Esquimalt, B. C, 

 Harvey) 1862. p. 175, under Callithamnion arbuscula var. 

 Pacificum); Vancouver Island, B. C, J. G. Agardh (1S76, p. 

 37, under Callithamnion arbuscula); Brown Island, San Juan 

 County. Wash.. Tilde n, Xo. 311!, under Callithamnion arbus- 

 cula; west coast of Whidbey Island, Wash., N.L.G., No. 231! 



Plant smaller and more bushy than the type, main and sec- 

 ondary axes less set off from one another, and the branchlets less 

 dense and less closely applied to the branches. The type of this 

 species, as represented in the type locality at the Golden Gate, 

 San Francisco, is shown in Xo. 390 of Collins, Holden and 

 Setchell. Phycotheca Boreali-Americana, and the f. laxum is 

 shown in No. 943 of the same distribution. The differences in 

 habit due to the differences in structure mentioned above bring 

 about a very considerably different aspect in the two sets of plants. 



Ptilota Asplenioides (Turner) Agardh. 



On other alga j in the upper sublitoral zone. St. Paul Island, 

 Alaska. Ruprecht (1851, p. 232), Far-low, Anderson and Eaton, 



