1 62 SAUNDERS [398] 



Phormidium autumnale (Ag.) Gomont. 



Forming a thin dark blue coating on small rocks in a rapid stream 

 emptying into Kukak Bay (332). Identified by Gomont. 



Phormidium laminosum (Ag.) Gomont. 



Forming a thin membranaceous stratum on perpendicular rocks 

 moistened by spray from a waterfall, Qrca (301). Identified by Go- 

 mont. 



Lyngbya aerugineo-ccerulea (Kuetz.) Gomont. 



In a felt-like mass of filaments of Vaucheria, 



Juneau (74) ; with Zygnema sp. in a small pond on an island in 

 the Muir Glacier (107). 

 Nostoc sphaeroides Kuetz. ? 



Forming a soft bluish green coating on rocks near Juneau (75). 



This species was submitted to Dr. Setchell, who says of it "The 

 Nostoc is a minute spherical one very often found but I am uncertain 

 as to whether it is N. sphceroides or not." 



Desmonema wrangelii (Ag.) Bor. & Fla. 



Mixed with Tolypothrix tennis from a clear brook emptying into 

 Glacier Bay (103). In a similar locality and associated with the same 

 species on Popof Island (404) . 



Family SCYTONEMA CE^ft. 

 Scytonema varium Kuetz. 



On rocks moistened by spray from a waterfall near Juneau (76). 

 Identified by Setchell. 



Scytonema myochrous (Dillw.) Ag. 



With Tolypothrix tenuis, forming small tufts on rocks in a brook 

 emptying into Glacier Bay. Identified by Setchell. 



Scytonema mirabile Bornet. 



On moist ground near Glacier Bay, with Microcoleus -vaginatus 

 (104). On the perpendicular surface of a rock, with Vaucheria, 

 moistened by dripping water, Kukak Bay (347). 



Scytonema figuratum Ag. 



In a freshwater stream emptying into Glaicier Bay (103 <5). 

 Tolypothrix tenuis Kuetz. 



Forming brownish or blue-green tufts attached to rocks in fresh 

 water. Glacier Bay (300) ; Popof Island (404). Identified by Set- 

 chell. 



