LICHALP

Trapelia placodioides Coppins & P. James

Lichenised.

Substrate: siliceous rocks

Altitudinal range: from the mesomediterranean belt (potential vegetation: evergreen broad-leaved forests dominated by Quercus ilex) 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: on base-rich or slightly calciferous siliceous substrata, sometimes also on walls, in humid areas, with optimum below the montane belt; probably more widespread in the Alps, but never common.