Parmelioid Lichens in India (A Revisionary Study) includes systematic accounts of 192 species belonging to 22 genera with coloured photographs, scanned pictures of TLC plates for secondary metabolites of each species, current nomenclature, key to the genera and species. For each species, basionym, synonyms, information on type collection, detail description, chemistry, remarks, variation, habitat and altitudinal distribution within and outside India, along with maps are provided. Glossary of botanical names and terms used in the text are also provided.
The important morphological characters to delimit genera and species along with scientific illustrations and scanning electron microscopic pictures are given in the general account. The conservation status of parmelioid lichens is also discussed. Extinct, endangered, vulnerable and endemic taxa are also listed. Eight localities are proposed as "Lichen sanctuaries" for the country owing to their luxuriant parmelioid flora.