postelsia 41 



green, yellow, red or brown lichens. 

 Sometimes a huge boulder is com- 

 pletely covered with lichens of one 

 color, or it may be mottled with irregu- 

 lar markings of various colors. In the 

 canons vertical walls of granite are 

 streaked with orange, green and red. 

 Great areas of solid color, many meters 

 in diameter, delight the eye. A trip 

 through a narrow canon reveals the 

 most marvelous color effects at every 

 turn of the road. 



Plants of the Mountain Parks and 

 Higher Foothills. The mountain parks 

 are somewhat level stretches of land 

 shut in on all sides by high mountains 

 or hills. They vary from a few to 

 very many square kilometers in extent. 

 The altitude of these parks in the re- 

 gion being considered is usually from 

 2,500 to 3,000 meters. Plants to reach 

 these parks from below must make 



