INTRODUCTION. 



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ur knowledge of the Freshwater Algæ of East Greenland is hased 

 so far as I know upon the following papers: 



Robert Boldt, Desmidieer från Grönland 1I888). 

 — Några Söttvattensalger från Grönland (1893). 

 F. Børgesen, Ferskvandsalger fra Østgrønland (1894). 

 E. Larsen, The Freshwater Algæ of East Greenland 1904). 



The first-mentioned paper deals, as is already shown in the 

 title, only with Desmids and these originate from the whole of 

 Greenland; from East Greenland 44 species are reported; they are 

 found in the collections of A. G. Nathorst and J.A.Berlin from "Kuns 

 Oskars hamn" near Angmagsalik, 65° 31' N. Lat. 



In the second paper, on the other hand, Boldt deals with several 

 freshwater algæ belonging to other groups which he had found on 

 studying the Desmids in the above-mentioned collections. He men- 

 tions 4 species from East Greenland, all from the same locality. 



In my paper, based upon material collected by N. Hartz during 

 the expedition to East Greenland, 1891 — 92, are described a little 

 more than 150 Chlorophycece and Cyanophycece ; they were mostly 

 gathered in the environs of "Hekla Havn" at "Danmarks 0" in 

 Scoresby Sound (ca. 70° 30' N. Lat.); some of the material also origi- 

 nates from "Hold with Hope" in Hudson Land (ca. 73° 30' N. Lat). 



Finally, in Larsen's paper 125 Chlorophycece are mentioned. The 



material collected by Kruuse and N. Hartz comes from localities 



from Kap Dan (65° 31' N. Lat.) up to Sabine Island (74°30'N. Lat.). In 



his paper Larsen brings together all the Chlorophycece hitherto known 



from East Greenland and they amount to 189 species in all; of these 



no less than 144 are Desmids. 



^ The present list is based upon collections from the Danmark- 



-— Expedition to the North-east coast of Greenland in 1906—1908. They 



^ all originate from the district around Danmarks Havn, 76^ 46' N. Lat. 



and 18° 43' W. Long., on Germania Land. 



The material was collected by Mr. A. Lundager with exception 

 of a single sample taken by Dr. Lindhard. 



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