Description: Thallus crustose, lichenized, greenish white, often white-pruinose, starting the life-cycle on the thalli of Solorina, several cm wide, often lobed at margin, delimited by a blackish prothallus; central part of thallus irregularly areolate, the areoles flat to convex, often blackish at margins. Perithecia black, bottle-shaped, with a rather pronounced beak. Excipulum black. Asci 8-spored, clavate. Ascospores submuriform, with 3-5 transversal septa and 1-2 longitudinal septa in the median part of the spore, brown at maturity, 37-42 x 12-13 µm. Photobiont chlorococcoid. Spot tests: all negative. Chemistry: no lichen substances.
Note: a juvenile parasite on Solorina, spp., especially Solorina saccata, later becoming autonomous, found on humic soil over calcareous substrata throughout the Alps, and present also in the Apennines, south to Calabria.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris