LICHALP

Verrucaria onegensis Vain.

Lichenised. Poorly known taxon.

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

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: a species with a relatively thick, areolate, brown thallus consisting of verruculose areoles (to 1 mm in diam.), hemispherically protruding (to 0.7 mm in diam.) ascomata resembling those of V. viridula, and ellipsoid to oblong ascospores (to 25 µm long); based on a type from NE Europe on dolomite; rare in temperate Europe; the few records from the Alps are not from calcareous rocks, and therefore need confirmation.