— 236 — 



Table of the plant organisms in the plankton from Heiöi. 



Ghlorophyceae. 

 Tribonema minus (Wille) Hazen, 



f. depauperata (Wille) nob c 



Botryococcus Braunii Kütz rr 



Oocystis lacustris Ghodat (?) rr 



Staurastrum paradoxum Meyen, v. 



longipes Nordst., forma . rr 



Staurastrum Sebaldi Reinsch, f. 



groenlandica Borges r 



Eudorina elegans Ehrbg r 



Flagellatae. 



Dinobryon divergens Imh c 



Geratium hirundinella (0. F. Müll.) 



Schrank r 



Peridinium Willei Huitf.-Kaas .... rr 



Bacillariaceae. 



Asterionellagracillima(Hantz.)Heib. r 



Diatoma hiemale (Lyngb.) Heib. . c 



Fragilaria capucina Desmaz. c 



— construens (Ehrbg.) Grun. 



et v. binodis (Ehrbg.) Grun + 



Synedra ulna (Nitzsch) Ehrbg., et 



v. longissima (Sm.) Brun c 



Melosira granulata (Ehrbg.) Ralfs, 



f. curvata Grun cc 



Melosira varians Ag + 



Animal s. 



Bosmina sp rr 



Rotatoria -f- 



Gothurnia sp r 



III. Phytoplankton from some Tarns near Thorshavn 

 (Strömö) in the Færoes. 



During a visit to the Færoes in the summer of 1903 I collected 

 some plankton samples in tarns (small mountain lakes) in the neigh- 

 bourhood of Thorshavn; especially in the mountain plateau Kirke- 

 börejn. Mr. Börgesen and I have previously published a little 

 paper on the phytoplankton of lakes in the Færoes x ) in which we 

 have given the result of our examination of some plankton-samples 

 made by us in different islands, but none of them were from the 

 island of Strömö. From that publication, we know that the phyto- 

 plankton in the Færoese lakes is poor, and only in one lake, Sor- 

 vaagsvatn in .Vaagö, we found a real lake plankton, the plankton 

 in the other samples being characterized as a tarn or pool 

 plankton. 



As a supplement to that investigation I shall in the following 

 pages give the result of my examination of 5 samples from 5 dif- 

 ferent tarns, four of which are situated in Kirkebörejn at a height 

 of 200—320 M. over the sea, the fifth near Velbestad at about 



J ) v. Botany of the Færoes, vol.11, Gopenhagen, 1903, pp.613— 624. 



