Atla oulankaensis is a rare species of saxicolous (rock-dwelling) lichen in the family Verrucariaceae.

The type specimen was collected by the first author from the Jäkälävuoma gorge in Oulanka National Park (Juuma, Koillismaa) at an altitude of 208 m (682 ft); there it was found growing on a shady dolomitic rock outcrop on a northwest-facing wall.

The species epithet oulankaensis refers to the type locality, which is, according to the authors, "one of the lichenologically most valuable areas in Finland".

[2][1] Molecular analysis of the internal transcribed spacer DNA regions suggests that Atla alaskana is the closest relative of A. oulankaensis, although they are readily distinguished by differences in morphology and ecology.

The perithecia are 0.30–0.38 mm in diameter with a pale to dark, depressed ostiole that is 30–100 μm wide.