LICHALP

Collema ryssoleum (Tuck.) A. Schneid.

Syn.: Collema meridionale Hue, Collema nigrescens (Huds.) DC. subsp. ryssoleum Tuck.

Lichenised.

Substrate: siliceous rocks

Altitudinal range: from the mesomediterranean belt (potential vegetation: evergreen broad-leaved forests dominated by Quercus ilex) to the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus)

Note: a mild-temperate lichen found on steeply inclined seepage tracks of basic siliceous rocks; a mainly western species in Europe, also reported from the base of the Western Alps.