vol. i] Setchell- Gardner. — Algce of Northwestern America. 333 



Odonthalia Aleutica (Agardh) J. Agardh. 



On rocks and algae in the lower litoral and upper sublitoral 

 zones. Unalaska, Alaska. G. A. Agardh (1820, pi. 5, under Rho- 

 dotriela Aleutica) ; Sbumagin Islands, Alaska, Saunders (1901, p. 

 43S) : St. Paul. Kadiak Island, Alaska. W.A.S. and A.A.L., 

 No. 5150!; Victoria. B. C, Tilden, No. 315!, under Rhodomela 

 floccosa form b) ; Esquimalt, B. C, Tilden, No. 314! under 

 Rhodomela floccosa; west coast of Whidbey Island, Wash., 

 X.L.G.. Nos. 16!. 92! 



This species is probably not uncommon along our northwest- 

 ern coast from the Strait of Juan de Fuca to Unalaska. It is 

 probably often confused with the next, but it is to be distin- 

 guished from it by the fact that the tetrasporie and eystocarpic 

 branches are not shortened or collected into a glomerule, but are 

 in a loose raceme. It is to be distinguished from coarser forms 

 of the last species by its distichous branchlets. 



Odonthalia floccosa (Esper) Falkenberg. 



Unalaska and Sitka, Alaska, Postels and Rupreclit (1810, 

 p. 14); Saunak Island. Alaska, Turner (1886, p. 85): Popof 

 Island. Kukak Bay, Yakutat Bay, Sitka, Wrangell, and Annette 

 Island. Alaska, Saunders (1901, p. 448) ; Strait of Juan de Fuca 

 and Point Roberts, B. C, Harvey (1862, p. 167). 



There has been much confusion in the specimens referred to 

 this species. Postels and Ruprecht (1840, p. 14) include the 

 preceding species and Fur us pilu lifer Turner, both of which 

 seem to us distinct. It has been confused with forms of Rhodomela 

 TJycopoMoides , etc., until it is difficult to determine from the 

 references whether they refer to the species as Falkenberg has 

 defined it or not. We have, therefore, given the references 

 above without comment. We have found three forms standing 

 out fairly distinctly from the mass of forms, viz. — f. ft/pica, f. 

 comosa, and f. macracantha, and have noted them below. 



Odonthalia floccosa f. typica Setchell and Gardner nom. nov. 



The typical form is represented by Esper (1802, pi. 130) and 



rather better by Turner (1808, pi. 8), under the name of Fucus 



floccosus. The type came from Port Trinidad, California, 



