LICHALP

Verrucaria fusconigrescens Nyl.

Syn.: Lithocia fusconigrescens (Nyl.) Flagey

Lichenised. Poorly known taxon.

Substrate: siliceous rocks, intermediate rocks (such as calciferous schists)

Altitudinal distribution: submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus)

Note: a species with an epilithic, greyish-brown to brown-black, rimulose to subareolate thallus, slightly to hemispherically protruding ascomata, the wall subhyaline in the lower half, involucrellum reaching down to the base of the perithecium, with a carbonised outer layer and brownish inner layer, and oblong ascospores (to c. 25 µm long); on siliceous substrata at low elevations; reported from several localities in SW Europe, including the Western Alps (France).