692 University of California Publications in Botany [Vol.8 



12. Fucus evanescens f. cornutus Kjellm. 



Fronds subcoriaceous, 20-30 cm. high, regularly dichotomous, dark 

 olive green to dark olive brown; segments strict, linear or very slightly 

 cuneate in the narrower specimens, 5-8 mm. wide, apices truncate, 

 midrib well developed, prominent, very slightly evanescent above, 

 alae narrow, cryptostomata very sparse, small; receptacles distinctly 

 delimited, mostly complanate, simple or bifurcate, blunt to acuminate, 

 apices slightly laterally reflexed, 2-4 cm. long ; conceptacles numerous, 

 conspicuous. 



Growing on rock ledges in the lower littoral belt. Yakutat Bay, 

 Alaska. 



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

 1895, p. 202; Setchell and Gardner, Alg. N.W. Amer., 1903, p. 283 

 (in part) ; Gardner, Genus Fucus, 1922, p. 50, pi. 55. 



Rev. Albin Johnson, no. 5719 (Herb. Univ. Calif., nos. 99103, 

 99104), Yakutat Bay, Alaska. 



This form was first discovered on Bering Island and described by 

 Kjellman {lac. cit.). Comparison with a photograph of the type and 

 with a small portion of the type specimen seems to make it fairly 

 certain that the two specimens collected by Albin Johnson, and cited 

 above, are correctly placed, although they are much larger in all parts 

 than Kjellman 's description calls for. More study of material in the 

 northern waters is highly desirable to make certain this determination. 

 Neither in the type nor the other material referred to is the cornute 

 habit very pronounced. 



13. Fucus evanescens f. rudis Kjellm. 



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, cryptostomata 

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

 complanate, mostly very tumid and mucilaginous, not definitely 

 delimited. 



Growing in the lower littoral and upper sublittoral regions. Bering 

 Sea to Skagway, Alaska. 



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

 1895, p. 202; Setchell and Gardner, Alg. N.W. Amer., 1903, p. 282; 



