Distribution: N - Lig (GDOR 1618). C - Tosc (Nascimbene & al. 2021), Sar (Scheidegger 1993).
Description: Thallus crustose, episubstratic, dull brownish grey, rimose to areolate, with clearly elongate marginal areoles but not placodioid. Cortex of anticlinally arranged, cellular hyphae, the terminal cells swollen, with brown caps; medulla white, I-. Apothecia biatorine, 0.2-0.3 mm across, innate, with a black disc and a narrow, brown proper margin. Proper exciple thin, aethalea-type, the inner hyphae hyaline, prosoplectenchymatous, the outer hyphae parallel and usually strongly brown-pigmented, N-; epithecium brown, N-; hymenium colourless, without oil droplets, c. 75 µm high; hypothecium dark brown. Asci 8-spored, clavate, Bacidia-type. Ascospores 1-septate, not constricted at septum, brown, oblong, 10-12 x 7-8 µm, Buellia-type, with a smooth wall. Photobiont chlorococcoid. Spot tests: thallus K+ yellow turning red, C-, KC-, P+ yellow-orange. Chemistry; norstictic and connorstictic acids.
Note: a Mediterranean species of hard siliceous rocks in warm-dry habitats, sometimes growing on other crustose lichens.