INTRODUCTION. 



О 



ur knowledge of the Freshwater Algæ of East Greenland is based 

 so far as I know upon the following papers: 



Robert Boldt, Desmidieer från Grönland (1888). 

 — Några Söttvattensalger från Grönland (1893). 

 F. Borgesen, 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 "Kung 

 Oskars hamn" near Angmagsalik, 65° ЗГ N. Lat. 



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

 freshwater algae 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 Chlorophyceœ and Cyanopbycece; 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 Chlorophyceœ are mentioned. The 

 material collected by Kruuse and N. Hartz comes from localities 

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

 his paper Larsen brings together all the Chlorophyceœ 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. 



6* 



