LICHALP

Caloplaca tristiuscula H. Magn.

Syn.: Rufoplaca tristiuscula (H. Magn.) Arup, Søchting & Frödén

Lichenised. Poorly known taxon.

Substrate: siliceous rocks, intermediate rocks (such as calciferous schists)

Altitudinal range: from the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron) 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: a silicicolous species of the C. arenaria-group with a dark grey to blackish-grey, verrucose thallus and apothecia with rusty-yellow discs and margins with an outer thalline cover, based on a type from Sweden, with a few records from the Eastern Alps.