FRESH-WATER DIATOMS FROM ICELAND 



81 



From this it appears that the distribution is very similar to 

 that of the rest of Europe, as 95 % of the Icelandic forms also 

 occur there; next come Asia and America with about 50 %. As for 

 the Arctic regions, Greenland stands highest with 41 °/o. In Iceland 

 the number of species is greatest and almost the same in S W. and 

 E., about 70 ° u; from these parts the greatest number of samples 

 originate, viz. 148 and 191 respectively. 



The Botany of Iceland. Vol. II. 



