936 



a. The plankton formation. 



The lacustrine phytoplankton of several of the lakes was found 

 to be scanty when investigated by F. Borgesen and the author (Bor- 

 gesen and Ostenfeld 1904). We found that Sorvaagsvatn alone 

 (Toftevatn and Leinumvatn have yet not been investigated) contained 

 a true lake-plankton which included Asterionella formosa, Dinobryon 

 divergens, Staurastra a. o. The plankton of the smaller lakes, so 

 far as examined, can only be called a poor pond-plankton, con- 

 sisting of various forms of Desmids, green Algæ, Diatoms and 

 Flagellates. Nothing further can be said until the plankton has been 

 studied in the different seasons of the year, regularly and at not too 

 distant intervals. 



We are also able to state that the character of this plankton 

 shows close agreement with that observed in lakes under similar 

 climatic condilions elsewhere, such as those in Scotland (W. West 

 and G. S. West 1903 and 1906 a), Ireland (W. West and G. S. West 

 1902 and 1906 b) and Iceland (Ostenfeld 1904; Ostenfeld and 

 Wesenberg-Lund 1906). 



b. The freshwater lithophyte formation. 



A meagre vegetation, consisting mainly of mosses and algæ, 

 occurs on stones and rocks in the lakes and streams. Owing to 

 lack of the necessary notes, I cannot, unfortunately, deal with this 

 particular formation so fully as desirable. C. Jensen (1897) and F. 

 Borgesen (1899, p. 322 and 1901, p. 204) give some attention to the 

 formation in their papers. The most conspicuous and presumably 

 the commonest moss on the stones and boulders is Fontinalis anti- 

 pyretica and in some piaces also F. gracilis; amongst others recorded 

 are Jiingermannia cordifolia, Hypniim nisciforme and riuulare, Pohlia 

 færoemis, Griinmia alpicola riviilaris, Amblystegiiim ochraceum, A. 

 Smithii and A. dilatatum. The more important of the numerous 

 mosses of the marginal vegetation along the streams will be men- 

 tioned later (p. 943). 



As regards Algæ a large green species, Cladophora glomerata, 

 grows abundantly on the crags and shelves of the lake on Kvalbo 

 Ejde. 



There is also a characteristic Enteromorpha association in 

 the watercourses at a considerable distance from the sea. This has 

 long been known from Lyngbye's record (1819, p. 64) and is re- 

 ferred to later by F. Borgesen (1901, pp. 243-45). I have also 



