110 HARPER 



of two habitats, with more or less intergradation and several 

 or many species in common. A dotted line indicates several 

 species in common without contiguity, and a single continuous 

 line with two marks across it indicates contiguity with few or no 

 species in common. 



In nature all these areas are bordered by transition zones, 

 which are usually too narrow to have any species confined to them 

 and have therefore been ignored. Of course several of the typical 

 habitat-groups partake more or less of the nature of transitions 

 between those on either side, but all those here recognized con- 

 tain some characteristic species. 



Around the edges of the diagram the dotted lines leading off 

 in various directions indicate affinities of certain habitat -groups 

 with others outside of the Altamaha Grit region, as have already 

 been pointed out in the detailed descriptions. 



Some Exceptional Habitats. 



There remain to be considered a few classes of habitats in the 

 Altamaha Grit region which are known as yet only from single 

 examples. Although it is not yet possible to generalize much 

 concerning these, some of them are so peculiar that they deserve 

 mention, and if other examples of them are discovered hereafter 

 they can then perhaps be properly classified. 



The most striking of these exceptional habitats occur in the 

 northwestern corner of Berrien County, within a few miles of 

 Tifton, and were visited the last week in September, 1902. 

 About three miles west of Tifton there is a small area of damp 

 shady woods, containing the following species: 



Cercis Canadensis 

 Magnolia grandiflora 



Liquidambar Styraciflua 

 Liriodendron Tulipifera 

 Morus rubra 

 Acer rubrum 



Nyssa Ogeche 



Arundinaria sp. 



Myrica cerifera 



Decumaria barbara 



Chionanthus Virginica 



Hamamelis Virginiana 



Baccharis halimif olia 

 Osmunda regalislj- 

 Helenium autumnal e 



