288 OHIO BIOLOGICAL SURVEY 



The Caves. Altlio not, strictly speaking, always rocky habitats, 

 the flora ot" the caves is clearly most nearly allied to that of the rocks. 

 Altho they have some elements in common, the moisture content of 

 these habitats separates them sharply into two classes. 



Dry Caves. Old Man's Cave (fig. 23) is the dryest of the large 

 caves. Its roof ovei-hangs sufficiently to protect it from all rainfall, 



Fig. 2:!. Old Ma 



> Cavt'. Araliii spiiKisn in Foregrdund. 

 ladder gives the scale. 



