Description: Thallus crustose, episubstratic, greyish brown, developing on the thalli of Dimelaena oreina. Medulla white, not amyloid, I-. Apothecia lecideine, black, 0.2-0.7 mm acrosss, sessile and constricted at base, with a convex disc and a poorly evident proper margin. Proper exciple radially formed, dark brown, the inner part of textura oblita, the outer of textura angularis, dispersa-type; epithecium brown; hymenium colourless, without oil droplets, 80-100 μm high; hypothecium dark brown. Asci 8-spored, clavate, Bacidia-type. Ascospores 1-septate, brown, ellipsoid, 12-16 x 6.5-7.5 μm, Buellia-type, with a microrugulate ornamentation. Pycnidia black, semi-immersed in the thalluis. Conidia bacilliform, 6-9 μm long. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a xeric subtropical lichen of hard siliceous rocks, starting the life-cycle on Dimelaena oreina; described from North America, but also found in the Mediterranean Region.
Growth form: Crustose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Subcontinental: restricted to areas with a dry-subcontinental climate (e.g. dry Alpine valleys, parts of Mediterranean Italy)