Benthic Algae — DAWSON 
429 
Plocamium violaceum Farlow 
Scagel, 1957; Dawson. 1959c, 1961 
Southern British Columbia to Islas San Beni- 
to, Baja Calif. 
Plocamiocolax pulvinata Setchell 
Scagel, 1957; Dawson, 1961 
Northern Wash, to Cabo Colnett, Baja Calif.; 
Isla Guadalupe 
fam. SPHAEROCOCCACEAE 
Caulacanthus indicus Weber van Bosse 
Dawson, 1951b 
Golfo Dulce, Costa Rica ? 
Caulacanthus ustulatus Kiitzing 
Dawson, 1961 
Isla Cedros to Isla Margarita, Baja Calif.; Isla 
Turner, Gulf of Calif. 
Taylorophycus laxa ( Taylor ) Dawson 
Dawson, 1961 
Isla Magdalena, Baja Calif. 
fam. GRACILARIACEAE 
Gelidiopsis tenuis Setchell & Gardner 
Dawson, 1954, 1957£, 1959, 1961 
Guaymas, Sonora, to Costa Rica; Revillagi- 
gedo Arch. 
Gelidiopsis variabilis ( Greville ) Schmitz 
Dawson, 1954, 1959, 19 60a, 1961 
Guaymas, Sonora, to Bahia Santiago, Colima 
Gracilaria ascidiicola Dawson 
Dawson, 1961 
Puerto Escondido, Gulf of Calif. 
Gracilaria brevis Taylor 
Taylor, 1945 
Guayas, Ecuador 
Gracilaria cerrosiana Taylor 
Dawson, 1961 
Isla Cedros to Punta Abreojos, Baja Calif. 
Gracilaria crispata Setchell & Gardner 
Dawson, 1951b, 1961 
Isla Tiburon, Sonora, to Costa Rica; Revilla- 
gigedo Arch. 
Gracilaria ecuadoreanas (Taylor) Dawson 
Dawson, 19497? 
Galapagos Arch. 
Gracilaria (?) linearis Kylin 
Smith, 1944; Dawson, 1949^ (as not of the 
genus Gracilaria) 
Monterey Peninsula; Point Sur, Calif. 
Gracilaria marcialana Dawson 
Dawson, 1961 
Bahia Agua Verde; Isla Espiritu Santo, Gulf 
of Calif. 
Gracilaria pachydermatica Setchell & Gardner 
Dawson, 1961 
Isla Cedros to Isla Magdalena, Baja Calif.; 
throughout the Gulf of Calif. 
Gracilaria ramisecunda Dawson 
Dawson, 1961 
Southern Gulf of Calif. 
Gracilaria rubrimembra Dawson 
Dawson, 1961 
Vicinity of Guaymas, Sonora 
Gracilaria rugulosa Montagne ? 
Farlow, 1902 
Galapagos Arch. 
Gracilaria skottsbergii Taylor 
Dawson, 19497? 
Galapagos Arch. 
Gracilaria spinigera Dawson 
Dawson, 1961 
Guaymas to Puerto Escondido, Gulf of Calif.; 
Isla Margarita, Baja Calif. 
Gracilaria subsecundata Setchell & Gardner 
Dawson, 1961 
Throughout the Gulf of Calif, to Bahia To- 
polobampo, Sinaloa 
