VOLUME LXIX 



NUMBER 6 



THE 



Botanical Gazette 



JUNE IQ20 



ECOLOGICAL SUCCESSION OF MOSSES 



CONTRIBUTIONS FROM THE HULL BOTANICAL LABORATORY 266 



Aravilla M. Taylor 



(with two figures) 



The work on which the present study in moss succession is 

 based has been confined , with the exception of that done at Mount 

 Carroll, Illinois, to what may be termed the Chicago region. 

 This includes localities showing the typical plant associations 

 within about 40 miles of the city of Chicago. Since the deep 

 rock canyon type of topography is entirely absent in this region, 

 a study has been made of the Carroll Creek canyon, east and west 

 of the town of Mount Carroll, which lies in nearly the same latitude 

 as Chicago and about 125 miles west. The work was begun 

 during the summer of 19 16 and continued through the years of 

 1917 and 1918. 



The nomenclature for the plant associations here employed is 

 largely that used by Cowles (3) in his ecological work carried on 

 about Chicago and other localities. Some of these terms may be 

 traced back to Warming (13), or perhaps farther. The first 

 botanist to make use of this classification by which Warming 

 divided all plants into xerophytes, mesophytes, and hydrophytes 

 in connection with bryophytes was Warnstorf (14). Since that 

 time Evans and Nichols (5) have employed these terms in describ- 

 ing the mosses of Connecticut. The terms hydrarch and xerarch 

 were employed by Cooper (2), and are here given the same mean- 

 ing. The terminology for the classification of the moss species has 



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