19 --] Gardner: The Genus Fucus on the Pacific Coast 47 



Kjellman. loc cit.; De-Toni, Syll, Alg., 1S95, p. 203 ; Setchell and 

 Gardner, Alg. N.W. Amer., 1903, p. 284; Collins, Mar. Alg. Vancouver 

 Island, 1913, p. 111. 



The type locality of this form is Spitzbergen, where Kjellman says 

 it grows at a depth of several fathoms. There are three fragments of the 

 form in the Herbarium of the University of California, no. 132622, from 

 Spitzbergen Islands, determined by Kjellman. These are represented 

 on plate 36 and. although authentic, they do not entirely coincide 

 with Kjellman 's descriptions and type specimens as shown on plate 47. 

 Apparently they are not representative specimens of this form. Plate 

 48 represents a form growing in the middle littoral belt at Juneau, 

 Alaska, that coincides very closely with Kjellman 's diagnosis and with 

 plate 47 of his type specimen of forma pergrandis. A striking feature 

 of the Juneau plants, however, is that practically every segment fruits 

 at the same time. The Butler and Polly plant referred here is peculiar 

 in being completely free from both caecostomata and cryptostomata. 

 The Johnson plant referred here might be considered a very large 

 specimen (45 cm. long) of F. evanescens f . comutus, and the Kjellman 

 plants have sterile segments. The simultaneous fruiting of the seg- 

 ments in the Juneau plant would indicate a much shorter fruiting 

 season than in such forms as f. magnificus, in which only a few of the 

 segments are fruiting at any one time. It would be of much interest 

 to know how constant and reliable these characters of fruiting or non- 

 fruiting of segments are as an aid to the determination of species. 



Fucus evanescens f. robustus S. and G. 



Plates 49 and 50 

 Fronds distinctly caulescent, 15-25 cm. high, much contorted, with 

 distinct stout stipe and holdfast, dichotomous, terminal portions 

 foliaceous, olive green to dark olive brown ; segments broadly cuneate, 

 terminal lobes rounded, 15-28 mm. wide, midrib distinct, slightly 

 reduced near the apices, alae membranaceous, cryptostomata sparse; 

 receptacles broad, oblong, ovate or obcordate, very variable in size, 

 1.5-3.5 cm. long, complanate, or much inflated, not mucilaginous, with 

 distinct margin free from coneeptacles which are large and projecting. 



Growing on rocks in sheltered, shaded localities along extreme high- 

 tide limit. St. Paul Island, Alaska, to Friday Harbor, San Juan 

 Island. Washington. 



Setchell and Gardner, Alg. N.W. Amer., 1903, p. 283. Fucus 

 platycarpus? Setchell, Alg. Prib. Isl. 1899, p. 593. 



The type specimen was collected by Miss Ida M. Rogers, no. 5724 

 (Herb. Univ. Calif., no. 99133), at Sitka, Alaska. The writer collected 



