vol.i] Setchell— Gardner. — Algce of Northwestern America. 315 



Apparently perfectly typical of this form. It is a cartilagi- 

 nous, thick, deep red form without marginal proliferations. 



Rhodymenia palmata f. typica subf. marginifera Harvey. 



On rocks in the middle litoral zone. Near Iliuliuk, Unalaska, 

 Alaska. W.A.S. and A.A.L., No. 5007!, Postels and Rupreehf 

 (1840. p. 18). 



Similar to the last in texture, usually of a paler color, and 

 with the characteristic proliferations from the margins. 



Rhodymenia palmata f. typica subf. linearis Setchell and 



Gardner subf. nov. 



Fronds gregarious, simple, without proliferations, elongated 

 linear-lanceolate, 30-65 cm. long and 1-2 (occasionally up to 3) 

 cm. wide: substance cartilaginous; color deep red. 



On rocks in the upper sublitoral zone. Yakutat Bay, Alaska, 

 Rev. Albin Johnson, No. 5709! 



An extraordinary variation of this form. Mr. Johnson says 

 that it is eaten by the natives at Yakutat Bay and that the 

 Thlinket name is "Raa-ts." 



Rhodymenia palmata f . mollis Setchell and Gardner f . nov. 



Fronds gregarious, simple or palmately lobed or cleft, more 

 or less linear-lanceolate to broadly ovate in general outline, 

 2< •— 40 cm. long- and 5-15 cm. wide, dull reddish purple in color, 

 and of more or less fleshy consistency. Tetraspores commonly 

 present, cruciate, situated among the filaments of the outer 

 layer. 



On rocks, forming a zone at low water mark. Agattu Island, 

 Alaska. Townsend, No. 5759! ; Bay of Unalaska, Alaska, W.A.S. 

 and A.A.L.l (a fragment) ; Esquimalt, B. C, Tilden, No. 304! , 

 under Gratelowpia Outlerioz; west coast of Whidbey Island, 

 Wash., X.L.G., Nos. 178!, 181!, 623!, and in Collins, Holden 

 and Setchell. P. B.-A., No. 934! 



This form is very different from f. typica in color and con- 

 sistency, but resembles it closely in shape. In structure, too, 

 the two forms are very similar, but f. mollis is very commonly 

 tetrasporic, while our specimens of f. typica are largely sterile. 

 The base of f. mollis is more cartilaginous than the portions 



