LICHALP

Lecidea decolor Arnold

Lichenised. Poorly known taxon.

Substrate: siliceous rocks

Altitudinal range: from the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies) 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 with a thin, rimose, whitish to greyish thallus (K-reaction negative, but medulla I+ violet), minute, black, non-pruinose apothecia, a brown hypothecium. a olive-green epihymenium, 8-spored asci, and oblong ascospores (12-15 × 5-6 μm); on siliceous rocks (e.g. mica-schist) at high elevations; only recorded from a few localities in the Alps. According to Hertel (in litt.) it belongs to the L. lapicida-group.