Fig. 135. — High in the mountains near the margin of the ice-sheet in southern 



Greenland. Valley glaciers are plentiful and patches of snow and neve (iced firn) 



persist through the summer where local topography allows. The macroscopic 



vegetation is often limited to Lichens on the exposed rocks. 



Fig. 136. — Upland scrub of Dwarf Birch and silky-leafed Willows constituting, 

 an altitudinal climax above tree-limit in northern Norway. 



411 



