PHYTO-GEOGRAPHICAL STUDIES 



BASED UPON 



THE FRESHWATER DIATOMS 



BY 



E. OSTRUP. 



IN Ihe following table I have eniimerated the freshWater forms 

 roiiiul in Ihe malerial from tlie Færoes and eompared them 

 witli Ihe freshwater Diatom-flora of other countries. The reason 

 why I have not inchided about 40 forms from salt and brackish 

 water of which by far the greater part occurs in one single gather- 

 ing (labelled: »Algæ mixed with Ghjceria marilima, Trangisvaag«) is 

 simply because if they were inchided we should arrive at a mis- 

 leading conclusion as to the percentage. Those species which cannot 

 be regarded as rare are marked M'ith an *. 



The abbreviations signify: G. Br. = Great Britain. Se. = The 

 Scandinavian peninsnla. R. — Russia. .1. M. = Jan Mayen. Sp. — 

 Spitzbergen. F. J. = Franz-Josef Land. E. Gr. = Flast Greenland. 

 W. Gr. — West Greenland. O. M. — »Die Hochseen des Riesengebirges« 

 investigated by O. Muller. Eu. = Europe, of course exclusive of 

 Great Britain, the Scandinavian peninsnla and Russia. 



l'J- 



