14 A Canadian Arctic Expedition, 1913-1918 



Anabaena Bory. 

 Anabaena catenula (Kiitz.) Bornet and Flahaut 



This species was found only in the material from the Hippuris swamp, 

 Herschel island. It was not common. 



Anabaena variabilis Kiitz. 



This species occurred in the lake at Teller, and in the big lake at Bernard 

 harbour. It was fairly frequent. 



SCYTONEMACEAE. 

 Scytonema Agardh. 



Scytonema crustaceum Ag. 



This plant was found in small fragments with Nostoc commune in a tundra 

 pond at Bernard harbour. This, I believe, is the first arctic record. 



Scytonema mirabile (Dillw.) Bornet 



Occasional fragments of this alga were found in a collection of plankton 

 and bottom deposits from Teller. 



Tolypothrix Kiitz. 



Tolypothrix lanata (Des.) Wartmann 



This alga was taken from the bottom of a melted tundra pond, CoUinson 

 point, June 4, 1914. 



Tolypothrix tenuis Kiitz. 



A few fragments were obtained from a tundra pond at Teller. 



STIGONEMACEAE. 



Hapalosiphon Nag. 

 Hapalosiphon fontinalis (Ag.) Bornet 



This also occurred as a few small fragments from the tundra pond at Teller. 



Stigonema Agardh. 

 Stigonema informe Kiitz. 



This occurred only in a tundra pond at Collinson point. Not common. 



Stigonema lubricum (Dillw.) Kiitz. 



The Hippuris swamp at Herschel island was the only locality from which 

 this was obtained. It was comparatively rare. 



Stigonema ocellatum (DUlw.) Thur. 



This alga was found in a lagoon just west of Martin point, and at Collinson 

 point. Common. 



RIVULARIACEAE. 



Calothrix Agardh. 

 Calothrix parietina (Nag.) Thur. 



This alga was the dominant species in calcareous incrustations on pebbles 

 in a creek containing warm water coming from hot springs and running into 

 the Sadlerochit river. 



Rivularia (Roth) Agardh. 



Rivularia borealis Richt. 



This species was obtained in a lagoon just west of Martin point, July, 1914. 

 Not abundant. 



