THE BHYOPHYTA OF ICELAND 



637 



by the severe climate and the snow, which remains over ex- 

 tensive tracts till late in the summer, and saturates the soil 

 with ice-cold snow-water. 



In the following table the first column consists of the species 

 which have been found in the Lowland region, the second column 

 the species which have been found in the Mountain region, and 

 the third the species which have been found in the Snow region. 

 A cross (4-) indicates that the species has its main distribution in 

 the region in question; a dash ( ) indicates that the species in 

 question decreases in frequency and extends to a more or less high 

 level (or low level) in the region in question, and a dot () indicates, 

 that the species has been found only in a few places close to the 

 boundary of the region to which it belongs, or that it has, on the 

 whole, been found so scantily that no opinion can be formed with 

 regard to its distribution within the different altitudinal regions. 



Table III. The Distribution of the Bryophyta in the different 



Altitudinal Regions. 



