79 



Plate 34.— Two habitats are shown here. Classification of channel: SYSTEM Riverine, subsystem Upper Perennial, CLASS Rock 

 Bottom, subclass Bedrock, water REGIME Permanently Flooded, WATER chemistry Fresh. Classification of shore: system 

 Riverine, SUBSYSTEM Upper Perennial, class Rocky Shore, subclass Bedrock, water regime Seasonally Flooded, water 

 chemistry Fresh. (Penobscot County, Maine; October 1977; Photo by R. W. Tiner) 



