FORESTKT SURVEY 215 



The relative abundance of Qnercus bicolor in the np- 

 laud. of the northern and central part of X. T. 7, and the 

 southern part of ^. T. 6. seems to in»iicate the previous 

 existence of a great many depressions in this region, some 

 of which must hiive been of considerable extent. This 

 region lies in the most thickly settle<l portion of Glencoe. 

 Man has lilleil in many of the depressions of this area : 

 hence, one is led to suspect that the only means of deter- 

 mining their natural existence is through a study of the 

 older trees which comprise the forest here. 



Between Park Avenue and South Avenue. Railroad 

 Avenue and Grove Street there are veiy few trees, but 

 they are the largest trees, as a group, which were found in 

 this region. They averaged twenty to twenty -four inches 

 in diameter. There is an area of al>out thirty acres be- 

 tween Hazel Avenue and South Avenue in which Qucrcus 

 hicolor and Qucrcus macrocarpa are the dominant trees. 

 A few trees of Frajtimus ni{fra were also found with tliese. 

 Adjoining and over-lapping this area were found Ulmus 

 amcricana. Fraj-inus amcricana, Qucrcus cllipsoidalis, 

 Quercus rubra. Prunus seroti-na, Pi/rws corona ria^ and 

 Acer saccharum. TThile Qucrcus macrocarpa was found 

 abundantly in the hydro-mesophytic areas, it was also 

 found on th mesophytic upland, but here in less abun- 

 dance. 



«2i The hydrarch mesophytic association — The transi- 

 tion from the hydro-mesophytic to the hydrarch meso- 

 phytic forest was. in almost eveiy instance, clearly 

 define<i. A higher elevation and a better drainage of the 

 land in these cases accompanied the change in forest 

 associations. In mapping the hydrarch mesophytic areas 

 no attempt has been made to sepaitite the hydrarch meso- 

 phytic forest proper from the transition type, which lies 

 between this forest and the upland hydrarch mesophytic 

 climax forest. 



The extremely varie<i aspect of the hydrarch mesophytic 

 forest in this region is due to the interference of man. 



The typical tree species in the order of their importance 

 found in the hydrarch mesophytic woods were Qucrcus 

 elUpsoidalis, Qucrcus macrocarpa, Cartfa cordiformiSy 

 Juglaus nigra, Ulmus americanaj Qucrcus rubra, Prunus 



