Pertusaria epacrospora is a rare species of corticolous (bark-dwelling), areolate lichen in the family Pertusariaceae.

Found in Australia, it was formally described as a new species in 1991 by lichenologist Alan W. Archer.

The type specimen was collected in Park Beach (Coffs Harbour, New South Wales) at sea level; here, it was found growing on trees in a coastal sand dune.

The lichen has a thin, pale yellowish-green thallus lacking soredia and isidia.

It has numerous wart-shaped apothecia, the same colour as the thallus, which measure 0.4–0.8 mm in diameter and which have a single, inconspicuous ostiole.