Synonyms: Berengeria turfacea var. microcarpa (Hepp) Trevis.; Rinodina turfacea var. microcarpa (Hepp) Körb.
Distribution: N - Frl (TSB 2759), Ven (Nimis 1994, Thor & Nascimbene 2007), TAA (Nascimbene & al. 2006), Lomb, Piem (Isocrono & al. 2004), VA (Piervittori & Isocrono 1999).
Description: Thallus crustose, episubstratic, thin and often evanescent or minutely granulose, white to greyish white, without a distinct prothallus. Apothecia lecanorine, usually abundant, 0.5-1(-3) mm across, constricted at base and often substipitate, with a concave to flat, black but often white-pruinose disc, and a prominent, smooth to crenulate, often white-pruinose thalline margin. Thalline exciple corticate, the cortex 20-40 µm thick, I-, the medulla with oxalate crystals unsoluble in K; epithecium brown; hymenium colourless, 100-150 µm high; hypothecium colourless, 30-60 µm high. Asci 8-spored, clavate, Bacidia-type. Ascospores 1-septate, brown, elongate-ellipsoid, 24-35 x 8-13 µm, with a well-developed torus and ontogeny of type A (apical wall thickening after septum formation). Pycnidia immersed in thallus. Conidia bacilliform, 4-5 µm long. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: with variable amounts of variolaric acid, zeorin and an unknown triterpenoid.
Note: an arctic-alpine, circumpolar species found on soil, bryophytes and plant debris over calcareous substrata in tundra-like habitats; widespread throughout the Alps.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris