LICHENOLOGY OF ICELAND 245 



slight competition to which the lichens are subjected. It must, 

 however, be remembered that the cold mountain heights in Iceland 

 appear to be less rich in lichens, than are the more low-lying parts, 

 and are remarkably poor when the fact is considered that the com- 

 petition on the part of other plants is only slight, or altogether 

 wanting; so that one is led to the conclusion that the climate, as 

 such, is not favourable. 



