46 University of California Publications in Botany [Vol. 10 



collections, if such exist. There are no numbers quoted, and hence I 

 will not attempt to place them. Most of the plants, particularly of the 

 southern portion of the range, undoubtedly belong to f. magnificus of 

 this paper. The illustration (loc. cit.) might well represent f. macro- 

 cephalus, but it was not stated whence the specimen was collected. 

 Kjellman 's type specimen is illustrated on plate 46. It shows a plant 

 with practically all the segments fruiting simultaneously, and the 

 description calls for a plant relatively small, with narrow segments, 

 5-6 mm. wide. Plants which have been placed under this form are 

 mostly very much larger in all parts, as well as differing in other 

 respects. I doubt if the form should be considered as extending 

 farther south than Juneau, Alaska, where it intermingles with forma 

 magnificus. I have illustrated a plant from Juneau on plate 45, 

 which I consider to be fairly typical. It is somewhat more robust than 

 the type, and many of the receptacles are obcordate. The form is quite 

 abundant at Juneau. 



Fucus evanescens f. pergrandis Kjellm. 

 Plate 47 



"F. evanescentis forma thallo 30 ctmr et ultra alto, 1-2 ctmr lato, 

 subcoriaceo, dichotomo, segmentis elongatis. costa parum prominente. 

 receptaculis inflatis vel complanatis, indivisis, oblongo- ellipsoideis vel 

 dichotomis, segmentis ovatis vel ellipsoideis." 



"Fairhavn et Mosselbav in fundo plurior£;vali. " 



Kjellman, Om Spetsb. Thall., II, 1877a, p'. 3. 



Fronds caulescent, robust, subcoriaceous, up to 40 cm. high, regu- 

 larly dichotomous, dark brown below to yellowish brown above, black on 

 drying; segments elongated, linear to slightly cuneate, 1-2 cm. wide, 

 midrib distinct, percurrent, cryptostomata varying from none to 20 

 per sq. cm. ; receptacles numerous, mostly complanate, occasionally in- 

 flated, mucilaginous, 1-2.5 cm. wide, 2.5^4 cm. long, entire to bifid; 

 conceptacles numerous, large. 



Plate 48 



Growing on boulders in the middle and upper littoral belts. 

 Unalaska. Alaska, to Puget Sound, Washington. 



Setchell and Lawson, nos. 3284, 4049 (Herb. Univ. Calif., nos. 

 99125, 99124), Amaknak Island, Alaska, and in Collins, Holden, and 

 Setchell, Phyc. Bor.-Amer. (Exsicc), no. XLVI, sub F. plaiycarpus ; 

 Rev. Albin Johnson, no. 5701 (Herb. Univ. Calif., no. 99126), Yakutat 

 Bay. Alaska; Gardner, no. 2230 (Herb. Univ. Calif., no. 201136), 

 Juneau, Alaska; Townsend, no. 5773 (Herb. Univ. Calif., no. 99129), 

 Kyska Island. Alaska ; Butler and Polly, no. 20 (Herb. Univ. Calif., 

 no. 99127), Port Renfrew, British Columbia. 



