Lichen exploration of West Kameng district and Tawang district of Arunachal Pradesh state, India located in the Eastern Himalayas reveal seventy nine lichens represented primarily by foliose (73%), a few fruticose (15%), dimorphic (8%), leprose (2%) and crustose (1%) types. Of these, seventeen species, one fruticose, sixteen foliose growth forms, belonging to 12 genera and 5 families are recorded as new additions to the lichen flora of Arunachal Pradesh state. The lichens were sampled at an elevation ranging from 1618 meter to 4509 meter. The diagnostic features of new additions to macrolichens of Arunachal Pradesh based on the phytogeographic affinities and distribution of species is briefly described. Keywords: Foliose, Fruticose, Elevation, Distribution.