76 F. Børgesen. 



This species was not earlier found in East Greenland but in 

 West Greenland it is known from Karajak (Richter, Süsswasseralgen 

 aus dem Umanakdistrikt, p. 4). 



Lo с. Lille Snenæs. 



Scytonemaceæ. 



Scytonema Ag. 



1. Se. Myochrous (Dillw.) Ag., Bornet et Flah., Revision des 

 Nostoc. hétérocyst p. 104. 



Børgesen, Ferskvandsalger. Østgrønland, p. 8. 



А few filaments most probably belonging to this species were 

 found in a small lake. 



Loc. Hvalrosodde: Lomsoen. 



Tolypothrix Kütz. 



1. T. lanata (Desv.) Wartm. Dornet et Flahault, Revision des 

 Nostoc. hétérocyst., p. 120. 



Børgesen, Ferskvandsalg. Østgrønl., p. 8 (Hekla Havn). 



The filaments were a little thicker than the measurements given 

 by BoRNET et Flahault, 1. c, namely 10 — 14 n. But after having 

 examined specimens referred by Bornet et Flahault to this species, 

 e. g. No. 184 in Wittrock & Nordstedt, Algæ Exsicc, I have also 

 here found filaments teaching this thickness and I have therefore 

 no doubt as to the correctness of the determination. 



Found in small lakes. 



Loc. Hvalrosodde: Lomsøen. 



Nostocaceæ. 



Nostoc Vauch. 



1. N. commune Vauch. Bornet et Flahault, Revision des Nostoc. 

 hétérocyst. p. 203. 



Børgesen, Ferskvandsalg. Østgrønl. p. 8. 



This species seems to be common. It is found partly in the 

 form of a large gelatinous membrane, partly also as more crumpled 

 masses. 



It occured in bogs aîid also in places laid dry. 



Loc. Basiskæret, Stormkap, Кар Bismarck, Rypefjcld 



Young small colonies of Nostoc were found in several collections. 

 They were e.g. common as blackish crusts, composed of fragments 

 of Algæ and Musci etc. on ground near the foot of a glacier at 

 "Thermomelerfjeld" and on damp ground at "Yderbugten". 



