684 University of California Publications in Botany [Vol. 8 



plant referred to in our Algae of Northwestern America, under f. 

 typica, from Harvester Island, Alaska. The latter plant is in the Her- 

 barium of' the University of California under no. 99139. It differs only 

 slightly from the wide form of F. evanescens from Spitzbergen, men- 

 tioned above, having more numerous, larger, and better developed 

 receptacles. There is much greater disparity of size between this speci- 

 men and Kjellman's f. "typica" than there is between Kjellman's f. 

 "typica" and his f. limitaia. If we admit the specimen determined 

 by J. G. Agardh from Spitzbergen as belonging with f. typica Kjell- 

 man, then the Harvester Island specimen which is so close to it had 

 probably better be allied with it at present, until more is known of 

 the forms from that island. However, it also seems very close to 

 Kjellman's f. " corfiuta," but has wider fronds and receptacles than 

 the type specimen of that form. 



We are referring here a series of plants collected on Kadiak Island, 

 Alaska, by G. B. Rigg, no. 100. These plants are only slightly wider 

 than the type specimen of Kjellman, and have numerous well developed 

 receptacles. They appear to be the closest in all characters to the type, 

 and we are taking them to be the best representatives of f. typicus 

 thus far discovered in Pacific coast waters. 



2. Fucus evanescens f. macrocephalus Kjellm. 



Fronds subcaulescent, 12-18 cm. high, subcoriaceous, dark brown 

 below varying to light brown or yellowish above ; segments linear to 

 slightly cuneate, 5-12 mm. wide, midrib well developed, percurrent, 

 alae rather thin, cryptostomata absent or sparse ; receptacles distinctly 

 delimited, complanate in part, but mostly very tumid and mucila- 

 ginous, light yellow, 2-3.5 cm. long, 1-2 cm. wide, simple, retuse, or 

 bifid ; conceptacles conspicuous. 



Growing in the middle of the littoral region. Bering Sea to 

 Juneau, Alaska. 



Kjellman, Om Beringh. Algflora, 1889, p. 34; De-Toni, Syll. Alg., 

 1895, p. 202; Saunders, Alg. Harriman Exp., 1901, p. 432, pi. 62, 

 fig. 1 ; Setchell and Gardner, Alg. N.W. Amer., 1903, p. 282. 



Saunders (1901, p. 432) reports this form as growing at Puget 

 Sound, Annette Island, Wrangell, Juneau, Sitka, Glacier Bay, Prince 

 William Sound, Cook Inlet, Kukak Bay, and Shumagin Islands, and 

 states: "This is the most abundant seaweed on the northwest coast." 



