Vol.. i| Setchell-Gardner. — Algw of Nortliivestern America. 189 



Microcoleus vaginatus (Vaiicher) Gomont. 



On damp gTound. Glacier Bay, Alaska, Smolders (1901, 

 p. 397) : La Conner, Skagit County, Wash., X.L.G., No. 335! 



The specimen collected by Gardner lielongs to (lomont's 

 variety nion tico la . 



Schizothrix lacustris A. Braun. 



In a pool of fresh water, near Prince William Sound, Alaska, 

 Sannders, No. 300! (1901, p. 397). 



Schizothrix lardacea (Cesati) Gomont. 



Forming bright rose-red tufts on rocks exposed to fresh water 

 spray. Near Iliuliuk, Unalaska, ir. A .*S'. and A.A.L., Nos. 4045 ! , 

 5038!, and in Collins, Holden and Setchell, P. B.-A., No. 955! ; 

 Orea, Alaska, Saunders (1901, p. 396). 



Schizothrix rubra (Meneghini) Gomont. 



Forming scum on deep pool of fresh water. Glacier Valley, 

 Unalaska, Alaska, A.A.L., No. 5025! 



The spechuens are in-eserved in formalin solution and while 

 the filaments agree, little can he made out of the color. 



Schizothrix Braunii Gomont. 



On dripping rocks. Near Iliuliuk, Unalaska, Alaska, W.A.S. 

 and A. A. L., No. 4032!; Orca, Alaska, W. L. Jepson,^o. 5175! 



Most of the sheaths are colorless, but some are of the char- 

 acteristic blue-black color of this species. The dissepiments are 

 granular. 



Family NOSTOCACE.4^:. 



Nostoc Linckia (Roth) Bornet. 



Floating, intermingled with other alga?, on [jonds of fresh 

 water. Near Coupeville, Whidbey Island, Wash., N.L.G., 

 Nos. 462!, 594! 



Nostoc rivulare Kuetzing. 



Forming floating masses of light brown jelly, in springs and 

 pools. Near Huntville, Unalaska, Alaska, ^Y.A.S. and A.A.L., 

 No. 4095! ; near Green Lake, Seattle, Wash., N.LJL, No. 584! 



