52 postclsta 



Along the border of these forest openings is 

 generally a zone of low, bushy, in many cases 

 stunted looking trees of Thuja pUcata and Tsuga 

 heterophylln. Now and then one encounters a 

 peculiar adaptation of Finns contorta to such a 

 habitat. When this species occurs in these mod- 

 ified bogs it is generally found fringing the edge, 

 altliough sometimes it has succeeded in estab- 

 lishing itself well out in the open. In either 

 case, the tree does not attain any considerable 

 height, (3-8 meters) and grows apparently very 

 slowly. In appearance it offers a peculiar con- 

 trast to the other trees around as the branches 

 are all clustered in a palm like crown at the top 

 (PI. XII.). Frequently one observes here the 

 phenomenon of old cones adhering far down on 

 the main stem. 7'hese have evidently been pro- 

 duced on adventitious shoot. 



c Forest of the river valleys. 



Under the conditions which these natural 

 drainage courses call forth, the vegetation shows 

 itself in a somewhat different aspect from that 

 developed at similar altitudes but in closer prox- 

 imitv to the sea. 



