1920] Setchell-Gardncr: ChloropJujccae 219 



Known in our region from East Sound, Washington, and San 

 Pedro, California. 



Kuetzing, Phyc. Gen., 1843, p. 267; Collins, Green Alg. N. A., 

 1909, p. 336. Conferva alhida Hudson, Fl. Aug., 1732, Ed. I, 1778, 

 Ed. II. p. 595; Dill^^Tn, Brit. Conf., 1809, p. 32, pi. E. 



Cladophora alhida is our most slender species as well as one of 

 very soft and spongy consistency. B}' these characters it is usually 

 to be distinguished, whether living or in dried specimens. 



15. Cladophora glaucescens (Griff.) Harv. 



Plants 10-40 cm. long, glaucous or yellowish green, loosely tufted, 

 much branched, ending in long, erect, acute, alternate or sometimes 

 secund, ramuli; segments at ba.se 50-60/* diam., in ramuli 25-30/x; 

 segments usually 4-6 diam. long, sometimes considerably longer. 



Nanaimo, Vancouver Island, British Columbia, to Oakland, Cali- 

 fornia. 



Harvey, Notice of a collection of algae, etc., 1862a, pp. 160, 161, 

 176 ; Collins, Mar. Alg. Vancouver Island, 1913, p. 103 ; Setchell and 

 Gardner, Alg. N.W. Amer., 1903, p. 224. Conferva glaucescens Grif- 

 fiths, /// Wyatt, Alg. Danm., no. 195. 



The above description is from Collins' Green Algae of North 

 America (1909, p. 336), and refers to the species on the Atlantic 

 coast. Its occurrence on our coast rests largely on the authority of 

 Harv^ey, who determined a plant collected by Dr. Lyall at Nanaimo, 

 B. C. There is but a single plant in Harvey's herbarium to represent 

 the species on our coast, and one of us (Setchell) has seen the specimen 

 and expresses some doubt as to its identitj^ with the Atlantic coast 

 plant. We are inclined, however, to refer here a plant collected by 

 one of us (Gardner, no. 2647) in the warm salt water pond at the 

 Key Route Power TTousc in Oakland, California. 



16. Cladophora Stimpsonii Harv. 



Plants loosel}^ tufted, up to 30 cm. high, light green, of delicate 

 and silky texture; filaments 100-150/* at the base, tapering gradually 

 upward, di- trichotomously divided, branches continuously but dis- 

 tantly forking, successively smaller, ultimate branches lateral, secundly 

 pectinate with long ramuli, 20-25/a diam., wuth rounded or slightly 

 pointed tips; segments 5-8 diam. long, longest near the base. 



On shells, etc. Ucluet Inlet, Vancouver Island, British Columbia, 

 to southern California. 



