vol.i] Setchell— Gardner.— Algai of Northwestern America. 367 



other forms, so that it cannot be considered to be a specific char- 

 acter. The form as -we understand it is synonymous with the 

 Corallina Vancovveriensis of Yendo, and like that, may be 

 divided into two subforms, as follows: subf. laxa, equalling C. 

 Vancovveriensis f. typica Yendo, and subf. densa equalling G. 

 Yanconveriensis f. densa Yendo. 



Corallina officinalis f. aculeata (Yendo) Setchell and Gardner 



comb. nov. 



In tide pools, uppermost "literal zone. Port Renfrew, B. C, 

 Yendo (1902, p. 720, under Corallina aculeata); East Sound, 

 Oreas Island, Wash., N.L.G., No. 917! 



Corallina aculeata Yendo is simply the distorted state of the 

 preceding form and the prickly, confusedly ramulose, and flattened 

 or angled branehlets, imperfectly, or in some cases, unusually 

 much calcified, are all due to unfavorable conditions of environ- 

 ment. 



Corallina gracilis Lamouroux. 



Mr. F. S. Collins has determined with some doubt, a speci- 

 men collected by Misses Butler and Polley at Port Renfrew, B. 

 C. as belonging to this species. 



Hildenbrandtia prototypus Nardo. 



On rocks in the middle literal zone. Harvester Island, Uyak 

 Bay, Kadiak Island, Alaska, W.A.8. and A.A.L., No. 5109!; 

 west coast of Whidbey Island, Wash., N.L.G., No. 406!; 

 Tracyton, Kitsap County, Wash., Tilden, No. 201!, under 

 Peysannellia Dubyi. 



The plants placed under this species are dark blood red and 

 represent what has been called H. sanguinea. They are darker 

 and thicker than the next. 



Hildenbrandtia prototypus f. rosea Hauck. 



On stones in the lower literal and upper sublitoral zones. 

 Port Clarence, Alaska, Kjellman (1889, p. 26, under Hilden- 

 brandtia rosea); Shumagin Islands to Puget Sound, Saunders 

 (1901. p. 441, under Hildenbrandtia rosea) ; west coast of Whid- 

 bey Island, Wash., N.L.G., No. 128! 



A much thinner species than the last, of a rose red color, 

 and may represent a distinct species. 



