vol.i] Setchell— Gardner. — Algce of Northwestern America. 361 



Tendo has done, since that genus, if separable at all from 

 Amphiroa, applies only to a very limited number of species, none 

 of which occur in our territory. 



Amphiroa tuberculosa f. typica Setchell and Gardner comb. 



nov. 



On rocks in tide pools in the litoral and upper sublitoral zones. 

 Sitka. Alaska. Postels and BuprecM (1840, p. 20), Saunders 

 (1901, p. 442); Port Renfrew, B. C, Yendo (1902, p. 714), But- 

 ler and Polley, No. 11! ; west coast of Whidbey Island, Wash., 

 X.L.G.. Xo. 83!; San Juan Island, Wash., Tilden, No. 301!, 

 under Amphiroa Galifornica. 



What we feel should be included under f. typica is well 

 described by Yendo under Amphiroa tuberculosa. It is a plant 

 which seldom, if ever, is emergent at low water and usually occurs 

 in water of considerable depth. In plants of such habitat we 

 usually find the joints thicker and less obcordate, though flat- 

 tened, but they also frequently have branches which are cylin- 

 drical and which resemble those of Amphiroa eretacea. Yendo 

 makes much of the branching of this species as being subdich- 

 otomous, but in reality the branching is pinnate, only much less 

 so than in some of the forms of this species. The difference is 

 not in kind, but in regularity and degree, and, consequently, not 

 a character to separate this form and the next from the rest of 

 the forms and give them specific rank. 



Amphiroa tuberculosa f. Californica (Decaisne) Setchell and 



Gardner comb. nov. 



On rocks in the upper sublitoral and in deep tide pools in the 

 litoral zones. Puget Sound, Bailey and Harvey (1862, p. 162, 

 under Amphiroa Californica) ; Strait of Juan de Fuca, Harvey 

 (1862, p. 169, under Amphiroa Galifornica); Port Renfrew, 

 B. C, Yendo (1902, p. 715, under Cheilosporum Calif or nicuni) . 



We have" not seen the type of the species of Decaisne, but if the 

 specimen distributed by Farlow and illustrated by Yendo, repre- 

 sents this species, then we feel certain that it is but a form of the 

 polymorphous species, A. tuberculosa. It should be somewhat 

 extended beyond Yendo's idea, however, and made to include all 

 the plants which have thick, irregularly triangular joints, with 



