Aspicilia calcitrapa Cl. Roux & A. Nordin
Lichenised.
Substrate: siliceous rocks
Altitudinal distribution: submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus)
Note: on siliceous rocks in sunny places at low elevations, where it forms a community together with Pertusaria chiodectonoides; most common in the Pyrenees, with a few records from the SW Alps.
