Substrate: calciferous rocks, intermediate rocks (such as calciferous schists)
Altitudinal distribution: alpine belt (potential vegetation: treeless Alpine grasslands and tundras, to the lower limit of perennial snow and the equilibrium line of glaciers)
Note: a species related to B. cinereorufescens, but the rimulose to areolate thallus pure white to bluish white (medulla I+ violet, thallus not reacting with K), with an effuse to subarachnoid marginal zone, apothecia (to c. 0.4 mm in diam) with dark brown discs and fully immersed in the areoles, 8-spored asci, and broadly ellipsoid, simple ascospores (c. 15 × 8-11 μm); on calcareous schist in the high alpine belt; so far only recorded from the Western Alps (Switzerland).
