\<>i- iJ SetcheU-Gardner. — Alg(e of Northwestern America. 



_i I 



Ulothrix implexa Knetzing;. 



Forming more or less expanded layers in localities near the 

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

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

 Alaska, IF.A.aS". (uul A.A.L., No. 4017!; on Pucus, Orca, 

 Alaska, W.A.8. and A.A.L., No. 5180! 



Determined l>y T. E. Hazen, through the kindness of Mr. 

 Collins. 



Ulothrix flacca (Engi. Bot.) Thuret. 



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

 ir.A.^S., No. 5251x!; Glacier Bay, Saunders, (1901, p. 412); 

 Fairhaven, Wash., N.L.G.. No. 194! 



Ttie determinations are all by Mr. Collins. 



Gayella polyrhiza Rosenvinge. 



On small boulders, well uj) in the litoral zone. West shore 

 of Amaknak Island, Bay of Unalaska, Alaska, ]r.A.(S. ami 

 A.A.L., No. 3279a!, and in (V)llins, Holden and Setchell, 

 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 tlie 

 FcProes. Borgesen (1902, p. 482) refers this species to Prasio/a 

 rrispa as sul)Si). marina, (det. F. S. Collins.) 



Hormidium sp. 



Species formerly referred to this genus, especially H. parietin uni 

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

 with Prasiola-forras in different stages of development. We 

 have referred them all under Prasiola. 



Microspora floccosa (Vaucher) Thuret. 



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

 (1862, p. 177, under Conferva floccosa) \ in creek, Port Renfi-ew, 

 B. C, TUden, No. 139b! 



Conferva bombycina (Agardh) Lagerhcim. 



Forming silky, yellow, gelatinous masses on dripping rocks. 

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



