Freshwater Algæ from Caucasus and Turkestan. 



By 

 Kaare Münster Strøm. 



(With Pl. II). 



T7ery little is known concerning the freshwater algæ of Caucasus 



and Turkestan. The only contributions to our knowledge 

 of the alga-flora of these districts are: 



W. Schmidle: Algen aus den Hochseen des Kaukasus (1897); 

 Schmidle: Einige von Dr. Holderer in Centralasien gesammelten 

 Algen (1900); K. E. Hirn: Einige Algen aus Centralasien (1900). 



During the autumn 1897 professor dr. N, Wille travelled 

 in Caucasus and Turkestan as sharer in a geologic excursion. 

 He collected a considerable material of freshwater algæ, con- 

 sisting of about 130 samples, which he this autumn transferred 

 to me for investigation. 



The results of the revision are communicated in the following 

 paper. As to be seen from this, the samples are exceedingly 

 poor. Of desmids, which usually form the greatest number of 

 species I have only found about twenty species. 



The only groups, which are fairly good represented are the 

 genus Chroococcus and the Oscillatoriaceæ. 



The genus Cladophora seems to domineer. In fact, all the 

 desmids and a great number of other algae were found between 

 the branches of Cladophora and Chara. 



Nyt Mag. f. Naturv. LVII. 1919. 9 



