696 University of California Publications in Botany [Vol. s 



No. 5252 of Setchell (Herb. Univ. Calif., no. 99101) from St. 

 Michael, Alaska, quoted above, is as near the type as could be desired 

 in every particular. The plants are about 10 cm. high, thus repre- 

 senting the upper limits in size as stated by Kjellman. The plants 

 under the other numbers referred to are all larger in all parts than 

 the measurements given by Kjellman, but they seem too closely linked 

 to the type to warrant separation without further studies of quantities 

 of material in the field. There is not the sudden widening of the 

 receptacles in any of the latter forms as in the type. The receptacle 

 character seems more closely allied to that of i.macrocephalus. 



18. Fucus evanescens f. oregonensis Gardner 



Plate 106 



Fronds distinctly caulescent, 15-20 cm. high, subcoriaceous, dicho- 

 tomous below, subsecund above, yellowish brown; segments narrow, 

 sublinear or slightly cuneate, 4-7 mm. wide, flaccid, smooth, midrib 

 narrow and distinct below, slightly evanescent above, cryptostomata 

 small, inconspicuous, 20-25 per sq. cm. ; receptacles tumid, distinctly 

 delimited, much wider than the segments bearing them, single or bifid, 

 broadly fusiform, apices very obtuse; conceptacles moderately 

 conspicuous. 



Growing on floats, piles, stones, etc., in the middle and upper 

 littoral belts. East side of Coos Bay, opposite North Bend, Oregon. 



Gardner, Genus Fucus, 1922, p. 40, pi. 40. 



This form seems decidedly distinct from all other forms previously 

 described. Judging from its size, color, character of the midrib, and 

 its general consistency, its nearest relatives are to be found in the 

 evanescens group, and close to forma flabellatus. The plants are 

 smaller, segments narrower and regularly dichotomous instead of 

 subsecund, and the receptacles are shorter and blunter than in that 

 form. The only locality from which it has been reported is the one 

 given above, where it grew in profusion. Doubtless it may be found 

 in other localities on the same bay. 



