vol. ij Setehell— Gardner. — Algce of Northwestern America. 21 i 



Ulothrix implexa Kuetzing. 



Forming more or less expanded layers in localities near the 

 months of small streams where the water is brackish, or, at 

 times, nearly fresh. On piles of a wharf, Ilinlink, Unalaska, 

 Alaska. W.A.8. and A.A.L., No. 4017!; on Fucns, Orca, 

 Alaska. W.A.S. and A.A.L.. No. 5180! 



Determined by T. E. Hazen, through the kindness of Mr. 

 Collins. 



Ulothrix flacca (Engl. Bot.) Thnret. 



On rocks, pebbles, old wood, etc. St. Michael, Alaska, 

 W.A.S., No. o251x!: Glacier Bay, Saunders, (1901, p. 112); 

 Faii-haven. Wash., X.L.G.. No. 194! 



Tne determinations are all by Mr. Collins. 



Gayella polyrhiza Rosenvinge. 



On small bonlders. well up in the literal zone. West shore 

 of Amaknak Island. Bay of Unalaska, Alaska, TT.A.S. and 

 A.A.L.. No. 3279a!. and in Collins, Holden and Setehell, 

 P. B.-A.. 914! 



This seems to be the only locality for this species discovered 

 outside of those on the west coast of Greenland and the 

 Faeroes. Borgesen (1902, p. 482) refers this species to PrasioJa 

 crispa as subsp. marina, (det. F. S. Collins.) 



Hormidium sp. 



Species formerly referred to this genus, especially R. parietin urn 

 (Vaueher) Kuetzing, have been found either pure or associated 

 with Prasiola-forms in different stages of development. We 

 ■ have referred them all under Prasiola. 



Microspora floccosa (Vaueher) Thuret. 



In pools above high water mark, Esquimalt, B. C, Harvey 

 ( 1862, p. 177, under Conferva floccosa) ; in creek, Port Renfrew, 

 B. C. Tilden, No. 139b! 



Conferva bombycina (Agardh) Lagerheim. 



Forming silky, yellow, gelatinous masses on dripping rocks. 

 Amaknak Cave on the west shore of Amaknak Island, Alaska, 



