Dirinaria applanata is a species of corticolous (bark-dwelling), foliose lichen in the family Caliciaceae.

The lichen was formally described as a new species, Parmelia applanata, by Antoine Laurent Apollinaire Fée in 1825.

[4] Chemical analysis of Dirinaria applanata lead to the discovery of nine unique compounds.

Alongside this, researchers have identified six phenolic compounds: divaricatinic acid, methyl divaricatinate, methyl-β-orcinolcarboxylate, methyl haematommate, divarinol, and ramalinic acid A. Additionally, two xanthones, namely lichexanthone and 4,5-dichlorolichexanthone, were also isolated.

This nectrioid fungus forms a pinkish colony with mainly solitary phialides producing ellipsoid, aseptate conidia in mucoid packets.