vol.i] Setchell— Gardner. — Algce of Northwestern America. 22/ 



ately branched. Also resembling some forms of G. utriculosa 

 Kuetzing, but a smaller plant, more matted in growth, and with 

 cells cylindrical to piriform, rather than ovoid with constricted 

 nodes. G. densa Harvey is looser in growth, with longer cells and 

 subacute tips. 



Cladophora coalita (Ruprecht) DeToni. 



Attached to rocks in the lower litoral zoiie. West shore of 

 Whidbey Island. Wash., X.L.G., No. 95! 



Mr. Collins writes that this species and the next have been con- 

 fused under the name of the latter. They are, however, certainly 

 distinct forms, and he is inclined to think, distinct species. No. 

 819, Collins, Holden and Setchell, P. B.-A., collected at San 

 Francisco, California, by R. E. Gibbs, belongs under the present 

 species and not under the next. 



Cladophora scopaeformis (Ruprecht) Harvey. 



Attached to rocks exposed to considerable wave action. 

 Kukak Bay, Yakutat Bay, and Sitka, Alaska, Saunders (1901, p. 

 414): Port Renfrew, B. C, Butler and Polley, No. 16; Esqui- 

 malt. B. C, X.L.G., Nos. 323!, 512!, 525!; west shore of 

 Whidbey Island, Wash., X.L.G., No. 18!, 122!, 203!, 516!, 

 517!, and in Collins, Holden and Setchell, P. B.-A., No. 922!. 



This plant which is the most common species in the region of 

 Puget Sound, is closely related to the preceding and the two dif- 

 fer from the other species in our list, with the exception of G. 

 spinescens, by having the older parts bound together in rope-like 

 masses by curving and hooked branchlets. G. coalita has stouter 

 filaments and shorter cells than G. scopceformis. Mr. Collins has 

 supplied the determinations and the notes. 



Cladophora spinescens Kuetzing. 



In spongy masses, on the tips of algBe and sponges, upper- 

 most litoral zone in exposed places. West shore of Amaknak 

 Island, Bay of Unalaska, Alaska, W .A.S. and A.A.L., No. 

 3258! 



Determined by P. S. Collins. 



