An extensive survey of lichens was conducted in different parts of Mathikettan Shola National Park, and analysed 55 macrolichen species under six families. Two species were found to be new to the Indian peninsula, and five species were new to the lichen flora of Kerala.

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A new species of Parmotrema with characteristic yellow medulla is described as new to science. The new species P. sahyadrica has a densely isidiate thallus with 6-10 mm wide lobes and contains entothein and atranorin as major compounds. The material was collected from Wayanad district of Kerala state at an elevation of 750 m.

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Macro lichens of Kalpetta Municipality of Wayanad District of Kerala state were studied. The study revealed about 21 macro lichen species. All the species identified are either foliose or fruticose forms belonging to families Coccocarpiaceae, Caliciaceae, Physciaceae, Parmeliaceae, Collemataceae, Lobariaceae, and Ramalinaceae indicating the dominance of these groups in the study area.