Xhe material treated in this paper falls in two parts. One 

 part containing about 60 glasses with Chlorophyceae was gathered 

 by C.Kruuse and N.Hartz who were members of the expedi- 

 tion to East Greenland, set on foot by the Carlsberg Fund in 

 1898—1900. 



The other part containing about 25 glasses with Chloro- 

 phyceae was gathered in 1899 and 1902 by С Kruuse in the 

 district of Angmagsalik. They were all preserved in alcohol. 



Of former works treating the Chlorophyceae of East Green- 

 land three are known to me: Boldt И, Boldt III and Borgesen I 

 (see List of writings). 



In Boldt 11 44 Desmidiaceae are stated, besides 4 Chloro- 

 phyceae in the little note of Boldt III. In Borgesen I a little 

 more than 100 Chlorophyceae are stated. 



In the above mentioned material I have found 125 Chloro- 

 phyceae of which 47 hitherto unknown from East Greenland. 



The following genera are not before mentioned from East 

 Greenland : Crucigenia, Polyedrium, Coelastrum, Ho7'mospora^ 

 Aphanochcete, Ophiocytium. 



The complete number of Chlorophyceae presently known 

 from East Greenland is 188, of which 150 Desmidiaceae. 



The following hst includes the species found by me, all 

 species formerly known and with certainty determined, besides 

 all their respective habitats. 



As to the species found by Boldt and Borgesen no account 

 is given of varieties nor forms, but only of the species. 



