Distribution: N - Ven, TAA, Emil (Fariselli & al. 2020), Lig. C - Tosc. S - Si (Caniglia & al. 2005).
Description: Thallus crustose, pale grey, thin and inconspicuous, granulose and poorly delimited. Apothecia biatorine, 0.4-1(-1.1) mm across, pale orange-red to grey-brown, not constricted at base, with a rapidly convex disc, without an evident proper margin. Proper exciple poorly developed, of more or less parallel, colourless to pale yellow hyphae, I+ blue; epithecium almost colourless to pale orange-yellow, K-, with a layer of crystals; hymenium colourless to pale yellow, I+ deep blue; paraphyses richly branched and anastomosing in upper part, 1.5-2 µm thick in lower part, the apical cells mostly not thickened; hypothecium pale grey-yellow. Asci many-spored, broadly cylindrical, apparently fissitunicate, but without a tholus, with a gelatinous, K/I+ intensely blue outer layer extending about one third the length of the ascus, and a simple, K/I+ blue apical dome. Ascospores 1-celled, hyaline, cylindrical, 8-13 x 2-3.3 µm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on calciferous, often slightly decalcified soil in rather disturbed habitats; chiefly southern in Europe; closely related to B. hemisphaerica. Most Italian records must be checked against the latter species.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris