LICHALP

Verrucaria viridula (Schrad.) Ach.

Syn.: Amphoridium leightonii (A. Massal.) Arnold, Amphoridium viridulum (Schrad.) Servít, Endocarpon viridulum Schrad., Verrucaria griseorubens Mig., Verrucaria leightonii A. Massal. non Hepp, Verrucaria obductilis (Nyl.) Zschacke, Verrucaria polygonia Körb.

Lichenised.

Substrate: calciferous rocks, siliceous rocks

Altitudinal range: from the mesomediterranean belt (potential vegetation: evergreen broad-leaved forests dominated by Quercus ilex) to the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies)

Note: an early coloniser of calciferous substrata, most common on small pebbles, also in urban areas (e.g. on roofing tiles); easily mistaken for V. macrostoma; widespread throughout the Alps.