134 



Periods of drought have little ill effect on the establishment of 

 the mosses, since they are extremely xerophytic forms, used 

 to drying out without injury. 



Late stages in this succession show seedlings well established 

 in the moss and by their shade killing off the mosses. The 

 species represented by the seedlings are in general the same as 

 were found in the other type of succession. 



University of Michigan Biological Station. 

 Cheboygan, Mich. 



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