vol.i] Setchell— Gardner. — Algce of Northwestern America. 207 



Kadiak Island, Alaska, W.A.S. and A.A.L., No. 5124!; lower 

 literal zone, west coast of Wkidbey Island, Wash., N.L.G.\ 



The plants referred under this species agree very well with 

 the description and figure of Rosenvinge, except that some have 

 apical papillae. Some of them do not have these and agree in this 

 with the original description. 



Family HYDRODICTYACE2E. 



Pediastrum Boryanum (Turpin) Meneghini. 



Intermixed with other alga? of fresh water pools. Point Bar- 

 row, Alaska, Farlow (1885, p. 192); Popof Island, Alaska, 

 Saunders, (1901, p. 409). 



Pediastrum angulosum (Ehrenberg) Meneghini. 



Intermixed with other alga? in shallow pools and ponds of fresh 

 water. Glacier Valley, Island of Unalaska, Alaska, A.A.L., 

 No. 5023a! ; Popof Island, Alaska, Saunders (1901, p. 409). 



Sorastrum spinulosum Xa>geli. 



Among water weeds in ponds of fresh water. Near Seattle, 

 Wash., Professor T. C. D. Kincaid, No. 768! 



Very scanty, but of undoubted occurrence in the specimen 

 quoted. 



Family ULVAOE.E. 



Monostroma lubricum Kjellman. 



Sitka, Alaska, Ida M. Bodgers, No. 5722! 



Monostroma latissimum (Kuetzing) Wittrock. 



On stones and mussels, lower literal zone, in more or less 

 brackish water. Iliuliuk, Unalaska, Alaska, W.A.S. and A. A. L., 

 No. 4020! ; on Fucus, lit oral zone, Uyak Bay, Kadiak Island, 

 Alaska, TT.A.iS'. and A.A.L., No. 5077! (a -younger form); in 

 brackish pools, near LaConner, Skagit County, Wash., N.L.G., 

 No. 567! 



Monostroma quaternarium (Kuetzing) Desmazieres. 



West coast of Whidbey Island, Wash., N.L.G., No. 187! 



