Abstract
Indiana is a very sensitively balanced climatic region where comparatively small differences in soil moisture induce striking differences in forest cover types. The author has pointed this out repeatedly for the rugged section of Indiana. Climatic climax is no doubt the mixed mesophytic forest in which beech and sugar maple are the most important members. Associated with them, however, in minor importance, at least by way of abundance and frequency index, are up to twenty additional species of trees. Included in the association are usually some of the more mesophytic oaks (Quercus muhlenbergii, Q. borealis var. maxima), and at times even Quercus alba. Ulmus fulva and Aesculus glabra, whose characteristic habitat is in more moist lowland situations, are also frequent associates.
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