398 SAUNDERS 



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, Orca (301). Identified by Go- 

 mont. 



Lyngbya aerugineo-coerulea (Kuetz.) Gomont. 



In a felt-like mass of filaments of Vaucheria. 



Juneau (74) ; with Zygne7na 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 (7=>). 



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

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

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



Desmonema wrangelii (Ag.) Bor. & Fla. 



Mixed with Tolypothrix tenuis from a clear brook emptying into 

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

 species on Fopof Island (404). 



Family 6" C TTONEMA CByE. 



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 dripj^ing water, Kukak Bay (347). 



Scytonema figuratum Ag. 



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



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. 



