Substrate: 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 resembling Rh. hochstetteri, but with a thinner thallus and smaller ascospores (only to 20 µm long); on siliceous rocks or schists containing a low content of calcium; widespread in the Northern Hemisphere, with a single record from the Western Alps (Switzerland).
