616 University of California Puhlications in Botany [Vol. 8 



2. Agarum fimbriatum Harv. 



Plate 71 



Holdfast of branched hapteres, profuse and slender in specimens 

 growing' on wood in sheltered localities, larger and denser in old 

 specimens growing in situations exposed to the action of the w^ater ; 

 stipe flat, 2-6 cm. long, 4-7 mm. wide, beset with numerous, often 

 branched, fimbriae on the margins, particularly near the blade; blade 

 thin and bullate, nearly circular to narrowly elliptical in outline, 2-8 

 dm. long, 1.5-2.5 dm. wide, base rounded or slightly cordate, margin 

 crisp and fimbriate, midrib fairly broad, complanate, perforations 

 few and irregular in outline ; color light brown. 



Growing in the sublittoral belt from 60 fathoms up to low water 

 mark on stones, other algae, or on piles, woodwork, etc. Abundant 

 in the quiet water of the lower Puget Sound region, particularly Island 

 County, Washington. Rare on the California coast but found floating 

 as far south as San Pedro. 



Harvey, Coll. Alg. N.W. Amer., 1862, p. 166 ; Setchell and Gardner, 

 Alg. N.W. Amer., 1903, p. 266; Setchell, Kelps of U. S. and Alaska, 

 1912fl, p. 155 ; Muenscher, Key to Phaeophyceae, 1917, p. 262, fig. 13 ; 

 Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. XCI; 

 Tilden, Amer. Alg. (Exsicc), no. 345, 



We have been able to examine hundreds of specimens of this species 

 from Puget Sound and to note its characters. The lack of distinct 

 scrolls at the base of the blade and the thin extremely flattened stipe 

 giving ofif, more or less abundantly fimbriate, haptere-like outgrowths, 

 are characters distinguishing this species from Agaruni crihrosiim 

 most satisfactorily. Outside of a few floating specimens, possibly 

 from deep water, found in southern California, A. fimhriatum is nar- 

 rowly confined to the region of the inner Straits of Juan de Fuca and 

 to the shores of Island County, Washington. 



The type locality is Esquimalt, near Victoria, British Columbia, 

 where it was dredged in 4-10 fathoms of water. 



TRIBE 4. HEDOPHYLLEAE setchell 



Stipes present only in very young plants, later disappearing or 

 remaining short and obscure; blade plane (or irregularly bullate), 

 soon becoming sessile and usually more or less decumbent, thickened 

 and emitting hapteres either scattered or in whorls ; meridional region 



