if--i] Setchell-Gardner : Melanopliijceae 667 



Fucus, so far as is at present known, is Oil Port, San Lnis Obispo 

 Countj% California. The northern limit has not yet been determined, 

 but it probably extends as far north as Cape Flattery, Washington, 

 where there is an intermingling of several forms whose limits have not 

 yet been determined. 



o. 



Fucus furcatus f. elongatus Gardner 



Fronds sparsely branched, distinctly arborescent, somewdiat f oliace- 

 ous, 3-5 dm. high, regularly dichotomous, angles wide and rounded, 

 dark olive green, dark olive brown on drying ; segments long, 10-18 

 mm. wide, euneate, terminal segment often ovate, rounded, growing 

 point slightly depressed, midrib narrow but distinct, frequently yel- 

 lowish above, alae wearing away below, remaining on 4-5 segments 

 from the apices, caecostomata variable but usually abundant, up to 

 450 per sq. cm., cryptostomata few, scattered, bearing fascicles of 

 long, exserted paraphyses ; receptacles dark brown to yellowish, either 

 complanate or much inflated, distinctly delimited, simple, emarginate 

 or bifid, blunt or acute, 3-5 cm. long; conceptacles not prominent or 

 abundant. 



Growing on boulders in the lower littoral belt in localities exposed 

 to the surf. South end of San Juan Island, Washington, and Sunset 

 Beach, near the mouth of Coos Bay, Oregon. 



Gardner, Genus Fucus, 1922, p. 21, pi. 9. 



This form is intermediate, in several of its characters, between 

 F. furcatus f. fypieus and F. furcaUis f. luxurians. On drying it is 

 smoother than either of the above mentioned forms, the caecostomata 

 not standing out so prominently. 



Gardner, no. 1973 (Herb. TTniv. Calif., no. 132743, and in Collins, 

 Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. CX, sub F. 

 evanescens f. macrocephalus Kjellm.) is typical of forma elongatus in 

 color, character of branching, having mostly wide and usually rounded 

 angles, character of segments and receptacles, but varies from the type 

 in having very few caecostomata. It is certainly quite different from 

 Kjellman's F. evanescens f. macroceplialus in all of its important 

 characters. 



