Benthic Algae — D awson 
397 
T halassiophyllum clathrus (Gmelin) Postels & 
Ruprecht 
Okamura, 1933; Scagel, 1957 
Bering Sea to Straits of Juan de Fuca ? 
Agarum cribrosum ( Mertens ) Bory 
Scagel, 1957 
Bering Sea to northern Wash. 
Agarum fmbriaium Harvey 
Scagel, 1957; Dawson, Neushul & Wildman, 
I960 
Puget Sound, Wash., to southern Calif. Chan- 
nel Islands 
Hedophyllum bongardianum (Postels & Ru- 
precht) Yendo 
Miyabe & Nagai, 1932; Scagel, 1957 (as 
Hedophyllum sub sessile) 
Bering Sea to Coos Bay, Oreg. 
Hedophyllum sessile (C. Agardh) Setchell 
Okamura, 1933; Scagel, 1957 
Aleutian Islands to Point Sur, Calif. 
Arthrothamnus bifidus (Gmelin) J. Agardh 
Setchell & Gardner, 1925 
Aleutian Islands, Alaska 
fam. LESSONIACEAE 
Dictyoneurum calif ornicum Ruprecht 
Scagel, 1957 
Vancouver I., British Columbia ?, to San Luis 
Obispo Co., Calif. 
Dictyoneuropsis reticulata (Saunders) G. M. 
Smith 
Smith, 1944; Silva, 1957 
Fort Ross; Monterey Peninsula, Calif.; north- 
ern Channel Islands 
Nereocystis luetkeana (Mertens) Postels & Ru- 
precht 
Scagel, 1957 
Shumagin I., Alaska, to San Luis Obispo Co., 
Calif. ( drift only to Santa Barbara ) 
Postelsia palmaeformis Ruprecht 
Scagel, 1957 
Hope I., British Columbia to San Luis Obispo 
Co., Calif. 
Macrocystis integrifolia Bory 
Womersley, 1954; Scagel, 1957 x 
Sitka, Alaska, to Carmel, Calif. 
Macrocystis pyrifera (Linnaeus) C. Agardh 
Doty, 1947; Dawson, 1954, 1957, 1959c; 
North, 1959; Dawson, Neushul & Wild- 
man, I960 
Sitka, Alaska, to Punta San Hipolito, Baja 
Calif., and sporadically to Isla Magdalena; 
Rocas Alijos 
Pelagophycus porra (Leman) Setchell 
Dawson, 1954; Dawson, Neushul & Wild- 
man, I960 
Point Conception, Calif., to Islas San Benito, 
Baja Calif. 
Lessoniopsis littoralis ( Farlow & Setchell ex 
Tilden) Reinke 
Scagel, 1957 
Sitka, Alaska, to Carmel, Calif. 
fam. ALARIACEAE 
Pterygophora calif ornica Ruprecht 
Dawson, 1954; Scagel, 1957 
Southern British Columbia to Bahia del Ro- 
sario, Baja Calif. 
Alaria dolichorhachis Kjellman 
Okamura, 1933; Setchell & Gardner, 1925 
Aleutian Islands, Alaska 
Alaria fistulosa Postels & Ruprecht f. fistulosa 
Okamura, 1933; Setchell & Gardner, 1925 
Bering Sea to Wrangel, Alaska 
Alaria fistulosa f. platyphylla Setchell 
Setchell & Gardner, 1925 
Bering Sea to southeastern Alaska 
Alaria fistulosa f. stenopylla Setchell 
Setchell & Gardner, 1925 
Bering Sea to southeastern Alaska 
