Vol.1] ;SetcheU-Gar(Itifr. — Alg(e of North irestern America. 861 



Yendo 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 Setchelland Gardner comb, 

 nov. 



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

 Sitka. Alaska, Postels and Ruprecht (1840, p. 20), Saiouhrs 

 (1901, p. W2) ; Port Renfrew, B. C, Yetido (1902, p. 714), Bnt- 

 Ipv and PoUey, Xo. 11! ; west coast of Whidbey Island, Wash., 

 X.L.G., No. 83!; San Juan Island, Wash., Tilden, No. 801!, 

 under Amphiroa Californica. 



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

 described by Yendo under Amphiroa tnherculosa. 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 hal)itat we 

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

 tened, ])ut they also frequently have branches which are cylin- 

 drical and which resemble those of Amphiroa crefacfa. Yendo 

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

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

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

 not ill 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 

 (lai'dner comb. nov. 



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

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

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

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

 B. C, Yendo (1902, \). 715, under Cheilospornm Californicinii) . 



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

 specimen distributed by Farlow and illustrated by Y'endo, rei)re- 

 sents this species, then we feel certain that it is ])ut a form of the 

 polymorphous species, A. tnhercidosa. It should be somewhat 

 extended be.yond Yendo's idea, however, and made to include all 

 the plants which have thick, irregularly triangular joints, with 



