Fig. 1. 

 Fig. 1. Lichen and crevice plant societies on shore rocks. PotentiUa 

 tridentata as crevice plant. 



Fig. 2. 

 Fig. 2. Bog of drained depression type. Sedge zone in foreground 

 with pitcher plant and Alpine cotton-grass; alder and chanaedaphne in 

 center and in front of trees; open water and aquatics at right; tama- 

 racks behind, with spruce-birch-balsam forest on high ground at right. 



