Synonyms: Lecidea hypocrita var. ligans (Nyl.) Hertel; Lecidea lithyrga sensu Fr. non Ach.; Lecidea sarcogynella Nádv.
Distribution: N - TAA (Hertel & Schuhwerk 2010).
Description: Thallus crustose, mostly endosubstratic and pale blue-green, rarely thinly episubstratic, continuous to finely rimose and chalky white, without a prothallus. Medulla white, mostly I+ pale blue. Apothecia lecideine, black, adnate, 0.2-0.7(-1.4) mm across, when young with a flat, bluish-pruinose disc and a thin, wavy proper margin, later progressively convex and immarginate, the disc finally cracked. Proper exciple thick, black in the thin outer rim, otherwise darker red-brown in inner part, paler in outer part, K+ reddish violet; epithecium blue-green; hymenium colourless or blue-green in upper part, brownish in lower part, 60-80 µm high; paraphyses strongly coherent, branched and anastomosing, 2-2.5 µm thick at mid-level, the apical cells to 5 µm wide; hypothecium red-brown, K+ reddish, darker than exciple. Asci 8-spored, clavate, with a I+ pale blue tholus and a central amyloid tube, approaching the Porpidia-type. Ascospores 1-celled, hyaline, ellipsoid with slightly pointed tips, 11-21 x 5-9 µm, halonate at least when young. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a rare, still incompletely understood taxon known from a few localities in the Alps, the Tatra Mountains and the Rocky Mountains in North America, found on limestone and dolomite, in sunny places.
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)