The current study enumerates the Pteridophytes in Pachaimalai hills, a rich biodiverse region in Eastern Ghats situated in Turaiyur taluk of Tiruchirappalli district. The distribution is associated with varied climatic condition, habitat, vegetation, light, temperature, moisture, soil, topography and monsoon. This study accounts 21 species from 17 genera belonging to 9 families and deals with their ecology and their habitat ranges from terrestrial, epiphytic or lithophytic.