Vol. 1] Setchell-Gardner. — AIg(v of Nortlnvestern America. 829 



Pterosiphonia Woodii (Harvey) Falkenberg. 



On the stipes of Pleui-ophycus and other kelps in the upper 

 sublitoral zone. Port Renfrew, B. C, Butler and PoIIei/, No. 

 1! ; west coast of Whidbey Island, Wash., N.L.G., Xos. 12! , 88! 



More or less common on the shores of California. 



Pterosiphonia arctica (J. Ag-ardh) Setchell and (Gardner comb, 

 nov. I 'lath li). 



On laro-e nh^i^ in the npper snblitoral zone or floating'. Near 

 Iliulink, Unalaska, Alaska. IT.A.N. and A.A.L., No. 0002!; 

 Shnmagin Islands, Alaska, S((inuh'):s (1901, p. 438, nnder Polij- 

 sipJionht arctica); west coast of Whidbey Island, Wash., X.L.G., 

 Nos. 09!, 226!, 227!, 418!, 511! 



We are nncertain as to the type of Folijsipltoiiia arctica .1. 

 Agardli, bnt we have been able to compare ours with a specimen 

 from Rosen vinge, throngh the kindness of F. S. Collins. This 

 specimen was old and battered and there was difficnlty in ol)tain- 

 ing good tips. Onrs seemed to be very close to it and conse- 

 quently we have placed it nnder this name. Onr plants vary 

 much in coarseness, are plainly distichous near the tips, have con- 

 stantly six or seven pericentral cells, and have the tips mucronate 

 and devoid of hairs. Our figures show the Alaskan specimens 

 which are coarser than those from Puget Sound. We have not 

 seen the plant of Saunders. Our plants are certainly good 

 species of Pterosiphonia as Falkenberg has described the genus. 



Lophosiphonia obscura (Agardh) Falkenberg. 



On sand covered rocks in the litoral zone. San Juan 

 Island, Wash., Titdcn, No. 817, under Poh/siphoin'a Idp'nntata f. 

 psamm'HoJa . 



This species is quite common on the coast of California. It 

 answers well to the descriptions of this species and has been com- 

 pared with European specimens by F. S. Collins. 



Lophosiphonia villum (J. Agardh) Setchell and Gardner comh. 



nov. 



On Fucus, lower litoral zone. St. Ptiul, Kadiak Island, 

 Alaska, W.A.ti. and A.A.L., No. 5138! 



