Bacidina flavoleprosa is a species of saxicolous (rock-dwelling), leprose (powdery) lichen in the family Ramalinaceae.

Bacidina flavoleprosa was formally described as a new species in 2012 by Paweł Czarnota and Beata Guzow-Krzemińska.

The type specimen was collected by the first author about 300 m (980 ft) west of Líchovy village in the Středočeská pahorkatina [cz] foothills of central Bohemia; there, at an altitude of 350 m (1,150 ft), it was found growing on the vertical faces of granite boulders in a humid microhabitat.

The photobiont partner of the lichen is chlorococcoid, and they have cells that are typically 5–12 μm in diameter.

Apothecia occur rarely; if present, they are beige to pale brown and measure 0.10–0.45 mm in diameter with a darker disc and a whitish-beige margin.