19G University of California Publications. [botani 



Tolypothrix tenuis Kuetzing. 



Forming bluish green tufts in quiet or flowing fresh water. 

 Popof Island, Alaska, Saunders, No. 404! (1901, p. 398); 

 Glacier Bay, Alaska, Saunders, No. 300! (1901, p. 398); near 

 Newhall, Orcas Island, Wash., N.L.G., No. 616! ; Green Lake, 

 Seattle, Wash., N.L.G., No. 562!. 



Tolypothrix Setchellii Collins. 



On Chara. Near Iliuliuk, Unalaska, Alaska, A. A.L.I 

 A dwarf species. 



Tolypothrix limbata Thuret. 



Growing on the side of a jar in the botanical laboratory of 

 the University of Washington. Seattle, Wash. , N.L.G., No. 500 ! 



The sheath in this specimen is very thick and is ocreate above. 



Desmonema Wrangelii (Agardh) B.&F. 



On stones in brooks or lakes, or even in pools on the tundra. 

 St. Michael, Alaska, 1U.A.»S'., No. 5157x! ; near Iliuliuk, Unalaska, 

 W.A.S. and A.A.L., Nos. 4008!, 4044! ; Popof Island, Alaska, 

 Saunders, No. 404! (1901, p. 398) ; Glacier Bay, Alaska, Saunders, 

 No. 103! (1901, p. 398). 



Family STTGONEMATACE^. 



Hapalosiphon fontinalis (Agardh) Bornet. 



In a fresh water pond. Seldovia, Cook Inlet, Alaska, 

 Saunders (1901, p. 399, under H. pumilus) . 



Fischerella ambigua (Kuetzing) Gomont. 



On vertical rocks, just above the high tide mark. Port 

 Renfrew, B.C., Tilden, No. 398!, under Hassallia byssoidea 

 f. cylindrica Tilden. 



Although the basal stratum and fasciculi of branchlets are 

 not well developed, yet the branches seem to indicate this species 

 rather than the one to which Miss Tilden has referred it. 



Stigonema ocellatum (Dillwyn) Thuret. 



On rocks or floating, in quiet or running fresh water. Near 



