1925] SetcheU-Gardner : Melanophyceae 605 



10. Laminaria Andersonii Farlow 



Fronds perennial ; holdfast spreading out at the very base of the 

 stipe, composed of numerous strong, overlapping branched hapteres ; 

 stipe large and very strong and elastic, terete, tapering upward and 

 flattening into the blade, 1-1.5 cm. diam., 5-8 dm. long, smooth and 

 glossy, with concentric layers and numerous deep-seated mucilage 

 ducts ; blade coriaceous, thick, smooth, divided often nearly to the 

 base into several narrow segments, 15-25 cm. wide, 5-8 dm. (up to 

 10 dm.) long; color rich dark brown. 



Growing in the upper sublittoral belt. Sitka, Alaska, to central 

 California. 



Farlow, in Anderson, List Calif. Mar. Alg., 1891, p. 220 ; Setchell 

 and Gardner, Alg. N.W. Amer., 1903, p. 255 ; Setchell, Regeneration 

 among kelps, 1905, p. 145, pi. 17, figs. 19-25, Kelps of IT. S. and Alaska, 

 1912a, p. 151 ; Collins, Holden and Setchell, Phyc. Bor.-Amer. 

 (Exsicc), no. IV. Hafgygia ''Andersoni" (Farlow) Areschoug, 

 Observ. Phyc, IV, 1883, p. 3. 



This seems to be a perfectly distinct species, with typically digitate 

 blade, stout, cylindrical, erect and rigid stipe, the latter having deep- 

 seated mucilage ducts. Its color, when living, is light brown. 



11. Laminaria platymeris De la Pyl. 



Holdfast forming a more or less globose mass of strong, irregularly 

 branched hapteres ; stipe thick, long or short, terete at the base, begin- 

 ning to flatten a short distance above the base, often becoming widely 

 complanate at the apex ; blade plane, from cuneate to deeply cordate 

 at the base, free from transverse bullae, more or less lacerated into 

 segments of different lengths and widths, mucilage ducts in both stipe 

 and blade. 



Ranging from Bering Sea to the Strait of Juan de Fuca. 



De la Pylaie, Flore de Terre-Neuve, 1829, p. 52; Setchell, Kelps 

 of the U. S. and Alaska, 1912rt, p. 151. Laminaria pl^tytoha De la 

 Pylaie, Ann. Sci. Nat., vol. 4, 1825, p. 178, pi. 9, fig. I {nomen 

 nudum?). Laminaria Bongardiana< Postels and Ruprecht, Illus. Alg., 

 1840, p. 10, pis. 13, 14 (in part); Kjellman, Om Beringh. Algfl., 

 1889, pp. 43, 44 (excl. syn. Hafgygia Bongardiana Areschoug, et 

 varr.). Laminaria taeniata Postels and Ruprecht, Illus. Alg., 1840, p. 



