Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) to the alpine belt (potential vegetation: treeless Alpine grasslands and tundras, to the lower limit of perennial snow and the equilibrium line of glaciers)
Note: this species, frequently considered as a synonym of D. diacapsis, differs in the tetrasporous asci and the thallus reacting strongly K+ yellow, then rapidly violet-red; it grows on gypsaceous or very porous calcareous rocks and soil in dry, sunny situations; so far, it has only been distinguished in the Western Alps (Haute-Vésubie, France)
