Pertusaria uttaraditensis

Pertusaria uttaraditensis is a rare species of corticolous (bark-dwelling), crustose lichen in the family Pertusariaceae. Found in Thailand, it was formally described as a new species in 2005 by Sureeporn Jariangprasert. The type specimen was collected from Phu Soi Dao National Park (Nam Pat district, Uttaradit province) at an elevation of 1020 m, where it was found growing on a foetid vine near a dry dipterocarp forest. The species epithet combines the province of the type locality with the Latin suffix -ensis ("place of origin").

The lichen has a smooth and dull, olive-green thallus with soredia, but lacking isidia. It contains 2'-O-methylperlatolic acid as a major lichen product.