LICHALP

Caloplaca caesiorufella (Nyl.) Zahlbr.

Syn.: Caloplaca leptocheila H. Magn., Lecanora caesiorufella Nyl.

Lichenised.

Substrate: siliceous rocks

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 species of the C. ferruginea-group with an endosubstratic to thin, whitish-grey thallus and sessile apothecia with both disc and margin of a reddish-brown colour; based on a type from Bering Island offshore from Kamchatka, where it was found on twigs and plant remains, and widespread in the Arctic on driftwood, therefore records from siliceous rocks and conspecifity with C. leptocheila in need of re-evaluation. In the Alps usually on stones and low outcrops, probably widespread, but distribution insufficiently known.