Description: Thallus crustose, episubstratic, continuous, thin to moderately thick, smooth to rugose or verrucose, whitish, creamy or pale grey, without a distinct prothallus, often forming large patches. Medulla white, I-, without crystals. Apothecia at first immersed-erumpent and apparently lecanorine, being surrounded by an entire to cracked pseudothalline margin, becoming lecideine and sessile (but broadly attached), often contiguous, up to 0.6 mm across. Disc black, epruinose, at first concave, then flat to slightly convex; proper margin thick in young apothecia, becoming thinner, but always prominent and persistent. Proper exciple more or less Aethalea-type, 35-50 μm wide, prosoplectenchymatous, with elongate, hyaline inner cells, and short, brown outermost cells; epithecium bluish green to green-brown, N+ purple; hymenium colourless, 50-70(-80) μm high, not inspersed with oil droplets; paraphyses capitate, the apical cells 3-5(-6) μm wide, with a dark brown cap; hypothecium colourless, 75-100(-120) μm high. Asci 8-spored, clavate, Bacidia-type. Ascospores 1-septate brown, ellipsoid, straight or slightly curved, (9-)11-13(-15) x (4-)5–6.5(-7) μm, Physconia-type, not constricted at septum, faintly microrugulate, with ontogeny of type A. Pycnidia numerous, black, subimmersed. Conidia filiform, curved, 12-20 x 0.5-1 μm. Photobiont chlorococcoid. Spot tests: thallus and medulla K- or K+ pale yellow, C-, KC-, P-, UV-. Chemistry: without lichen substances, or with lichesterinic acid.
Note: this species is known from coastal areas only, from the western Mediterranean Region to the Atlantic coast of southern Portugal and of the Canary Islands. It grows in coastal-dune areas, mainly on Juniperus, accompanied by other, typically maritime Mediterranean-Atlantic-Macaronesian lichens.