596 University of California Publications in Botany L VoL -8 



plants we have referred here. We have not met with any forms 

 referrable to L. Ayardhii, i.e., entirely destitute of mucilage ducts. 



On our coast at least two forms of this species may easily be 

 distinguished : 



Laminaria saccharina f. linearis J. Ag. 



Holdfast composed of an abundance of relatively small branched 

 hapteres extending along the stipe up to 8 cm. above the base, stipe 

 slender and short, blade with cuneate base, 12-18 cm. broad, 2.5-3.5 m., 

 or more, long, with two distinct rows of bullae extending the entire 

 length of the blade just within the margin. 



Growing on rocks in localities subjected to the action of the water, 

 in the upper sublittoral belt. From Unga, Alaska, to Puget Sound, 

 Washington. 



J. Agardh, De Lamin., 1867, p. 12 ; Saunders, Alg. Harriman Exp., 

 1901, p. 429, "forma b."; Setchell and Gardner, Alg. N.W. Amer., 

 1903, p. 261 ; Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc.), 

 no. LXXXVIII. 



Laminaria saccharina f. membranacea J. Ag. 



Hapteres strong, stipe longer than in the preceding, frond ample, 

 membranaceous, often of delicate consistency, not holding together 

 when lifted from the water, more or less undulate or bullate; large 

 fruiting specimens at Sitka, Alaska, are stiff and rigid, not readily 

 torn. 



Growing on rocks, logs, floats, etc., in the upper sublittoral belt. 

 From Alaska southward to Coos Bay, Oregon. 



J. Agardh, De Lamin., 1867, p. 13 ; Setchell and Gardner, Alg. 

 N.W. Amer., 1903, p. 261 ; Saunders, Alg. Harriman Exp., 1901, p. 429, 

 "forma a." Laminaria saccharina Tilden, Amer. Alg. (Exsicc), 

 no. 240. 



2. Laminara complanata (S. and G.) Setchell 



Plate 57 

 Holdfast of few, rigid, slightly branched hapteres ; stipe 3-5 dm. 

 long, terete below, much flattened above, varying from 8-12 mm. diam. 

 below, to 20-25 mm. wide and 2-4 mm. thick above, without mucilage 

 ducts; blade 80-100 cm. long, 40-50 cm. wide just above the base, in 

 many specimens short and nearly circular in outline, amply ruffled, 



