Pertusaria loeiensis

Pertusaria loeiensis is a rare species of 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 Nahaeo National Park (now known as Phu Suan Sai) (Loei province) at an altitude of 540 m, where it was found in a dry evergreen forest growing on the bark of Neolithea. It is only known to occur at this location. The species epithet combines the province of the type locality with the Latin -ensis ("place of origin"). The main distinguishing characteristics of Pertusaria loeiensis are its asci, which contain only two spores, and the presence of the lichen products 2-O-methylperlatolic acid and stictic acid.