PLANT SUCCESSIONS OF MT. ROBSON 



221 



The lower plants include Luinuea borealis L., FyroUi chlorantha, 

 Phegopteris Dryopteris, Cladonia spp., and the climax forest 

 mosses, most important among them being Hypnum crista- 

 castrensis L. Large talus blocks are everywhere in evidence, 



Fig. 2. Climax forest upon talus: Picea Engelmanni, Thuja plicata. Near 

 Lake Kinnev. 



but are thoroughly covered with mosses. The soil between the 

 blocks is practically pure humus. This then is apparently the 

 condition toward which the talus areas above are slowly pro- 

 gressing. 



