LICHALP

Rhizocarpon geographicum (L.) DC. subsp. lindsayanum (Räsänen) Ahti

Syn.: Rhizocarpon lindsayanum Räsänen, Rhizocarpon riparium Räsänen subsp. lindsayanum (Räsänen) J.W. Thomson

Lichenised. Poorly known taxon.

Substrate: siliceous rocks

Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) 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: this subspecies seems to have a circumboreal distribution. It is found on siliceous, often dust-impregnated rocks, also on walls and boulders in semi-urban environments.