Resources of Pteridophytes in Limestone Regions in Hainan Island

There are 181 species of pteridophytes detected in limestone regions on Hainan island,which belong to 70 genera and 37 families according to the taxonomic system of Ching Ren-chang in 1978.According to the main uses and ecological characteristics of the pteridophytes in limestone regions on Hainan island,they can be classified into 4 types,viz.medicinal pteridophytes,ornamental pteridophytes,edible pteridophytes and indicator pteridophytes of limestone regions.Introduction and suggestions of exploitation,utiliztation and conservation of these pteridophytes are given in this paper.