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

The type specimen was collected by the first author along the shore of the Oulankajoki river in Oulanka National Park (Koillismaa); there, at an altitude of 180 m (590 ft), it was found growing on a dolomite rock outcrop jutting out from a southwest-facing rock wall.

The perithecia are immersed in the thallus, and measure 0.12–0.27 mm in diameter, and have a dark ostiole (pore) that is often inconspicuous.

The exciple (the ring-shaped tissue layer surrounding the hymenium) measures 0.15–0.25 mm and has a dark brown wall.

[1] Verrucaria oulankaensis grows on calcareous rocks, and all collections have been made from rivers shores – a particular habitat that is rare in Finland.