Description: Thallus small-squamulose greenish brown, matt, the squamules adpressed to raised at margins, contiguous to slightly overlapping, weakly crenulate-lobulate, 0.2-0.5 mm wide, 100-150 µm thick, paraplectenchymatous throughout, the cells 5-8 µm wide. Upper cortex up to 20 µm thick, poorly developed, consisting of 1-3 layers of cells free of algae; medulla and lower cortex not differentiated; rhizohyphae colourless, 2.5-3 µm thick. Perithecia black (somehow paler around the ostiole), originating among the squamules, subglobose, 0.25-0.40 mm across. Exciple colourless to pale brown, c. 25 µm thick; involucrellum black, completely surrounding the perithecium 25-35 µm thick (thicker in upper part). Periphyses 20-30 x 1-1.5 µm. Asci 8-spored, narrowly clavate, the wall I-. Ascospores 1-celled, hyaline, ellipsoid, (19-)20-24(-25) x (8-)9-11(-12) µm. Pycnidia unknown. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on bryophytes overgrowing boulders of limestone; known from the type locality in the Eastern Alps, and from Portugal; to be looked for in Italy.