Verrucaria transiliens (Arnold) Lettau

Syn.: Amphoridium transiliens Arnold
Lichenised.
Substrate: calciferous rocks
Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) to the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)
Note: on calcareous pebbles (e.g. on calciferous sandstone) near the ground, especially in clearings of woodlands and on track sides; probably overlooked, or confused with similar species, and perhaps more widespread in the Alps.
Austria: Vorarlberg; Steiermark; Oberösterreich; Niederösterreich (incl. Wien); Italy: Friuli; Piemonte;