Benthic Algae — D awson 
383 
Halimeda tuna (Solander) Lamouroux 
Dawson, 1954 
Isla Clarion, Revillagigedo Arch. 
order DASYCLADALES 
fam. DASYCLADACEAE 
Acetabularia moebii Solms-Laubach 
Dawson, I960* 
Revillagigedo Arch.; Bahia Carrizal, Colima 
Ne omens annulata Dickie 
Dawson, 1959 
Isla Partida, southern Gulf of Calif. 
Neomeris vanbosseae Howe 
Dawson, 1954 
Isla Socorro, Revillagigedo Arch. 
phylum CHRYSOPHYCOPHYTA 
ORDER VAUCHERIALES 
fam. PHYLLOSIPHONACEAE 
Ostreobium quekettii Bornet & Flahault 
Scagel, 1957 
Puget Sound, Wash. 
Ostreobium reineckei Bornet 
Dawson, 1954 
Isla Guadalupe, Baja Calif.; Isla Clarion, Re- 
villagigedo Arch. 
fam. VAUCHERIACEAE 
Vaucheria litoria Bang & C. Agardh 
Scagel, 1957 
Northern Wash. 
Vaucheria longicaulis Hoppaugh 
Hoppaugh, 1930; Taylor, 1952 
Elkhorn Slough, Monterey Co., Calif. 
Vaucheria thuretii Woronin 
Doty, 1947 
Charleston, Oreg. 
phylum PHAEOPHYCOPHYTA 
order ECTOCARPALES 
fam. ECTOCARPACEAE 
Pylaiella gardneri Collins 
Smith, 1944 
San Francisco to Carmel, Calif. 
Pylaiella lift oralis (Linnaeus) Kjellman 
Scagel, 1957 
Bering Sea to San Pedro, Calif. 
Pylaiella tenella Setchell & Gardner 
Scagel, 1957 
Neah Bay, Wash.; Monterey, Calif. 
Pylaiella unilateralis Setchell & Gardner 
Setchell & Gardner, 1925; Doty, 1947 
Coos Bay, Oreg. 
Pylaiella washingtoniensis Jao 
Scagel, 1957 
Northern Wash. 
(Note: Hamel (1939) and others treat some 
species of Ecto carpus under the separate 
genera Giffordia and Eeldmannia) 
Ecto carpus acuminatus Saunders 
Smith, 1944 
Pacific Grove to San Pedro, Calif. 
Ecto carpus acutus Setchell & Gardner var. acutus 
Scagel, 1957 
Puget Sound to Carmel, Calif. 
Ectocarpus acutus var. haplogloiae Doty 
Doty, 1947; Scagel, 1957 
Neah Bay, Wash.; Oreg.; Moss Beach, Calif. 
Ectocarpus affinis Setchell & Gardner 
Setchell & Gardner, 1925 
Sitka, Alaska 
Ectocarpus breviarticulatus J. Agardh 
Dawson, 1954, 1954c 
Isla Guadalupe, Baja Calif.; Isla San Bene- 
dict, Revillagigedo Arch.; San Agustin, 
Oaxaca 
