1922] Gardner: The Genus Fucus on the Pacific Coast 53 



Fucus evanescens f. rudis Kjellm. 

 Plate 57 



* ' f . f ronde caulescente ; segmentis inf erioribus valide costatis, 

 cuneiformibiis, superioribiis coriaeeis, costa plus minus prominente, 

 1-1.5 cm. latis; receptaculis maximis, inferne non limitatis, raro 

 simplicibus, ambitu linear! ellipticis, vulgo plus minus deeomposito- 

 furcatis. segmentis sublinearibus ; scaphidiis magnis." 



"Fig. Fucus vesiculosus Post, et Rupr., 111. Alg., t. 30." 



"Beringon. vmnig; salLskaplig inom litoralregionen ; med recep- 

 takler." 



Kjellman, Om Beringh. Algflora. 1889, p. 34. 



Fronds somewhat caulescent, coriaceous, dark brown, dichotomous; 

 segments strict, cuneate, 1-2 cm. wide, reduced at the forking, terminal 

 lobes truncate, midrib narrow but distinct to the apices, crj'^ptostomata 

 absent or rare ; receptacles relatively large, 3.5-5 cm. long, rarely com- 

 planate, mostly very tumid and mucilaginous, not definitely delimited. 



Growing in the lower littoral and upper sublittoral regions. Bering 

 Sea to Skagway. Alaska. 



Setchell and Lawson. no. 5121 (Herb. Univ. Calif., no. 99131), 

 Harvester Island, Uyak Bay, Alaska. Fucus evanescens f. macro- 

 cephalus, Setchell and Lawson, no. 5178 (Herb. Univ. Calif., nos. 

 99117, 99118), Orca. Alaska: A. L. Bolton (Herb. Univ. Calif., no. 

 99115), Skagway, Alaska. 



Kjellman, loc. cit.- De-Toni, Syll. Alg.. 1895. p. 202; Setchell and 

 Gardner, Alg. N.W. Amer., 1903, p. 282. Fucus vesiculosus Postels 

 and Ruprecht, 111. Alg., 1840, p. 12, pi. 25 (cf. Kjellman, loc. cit.). 



Kjellman cites plate 30 of Postels and Ruprecht, Illustrationes 

 Algarum, as representing this form. Plate 30 is labeled "Con- 

 stantinea rosa marina," but has in addition a small plant of Fucus. 

 This plant has long, acuminate receptacles. Plate 25 of the same work, 

 to which Kjellman probably refers, is labeled Fucus vesiculosis and 

 has decompositely furcate receptacles with long, acuminate apices. 

 The plants referred here by Setchell and Gardner (1903, p. 282) have 

 the characteristic receptacles referred to above. Comparison with a 

 photograph of Kjellman 's type specimen hardly bears out his con- 

 clusion regarding the illustration in Postels and Ruprecht. The fronds 

 are reduced in width above each forking. Some of the receptacles are 

 relatively wide, others are very narrow, and those of Kjellman 's type, 

 which I have seen, are very blunt. Some doubts must be entertained 

 as to the limits of this form. I am referring here plants from Orca 

 and Skagway, cited above, as more nearly coinciding with Kjellman 's 

 type. 



