Verrucaria olivacella Servít

Lichenised. Poorly known taxon.
Substrate: siliceous rocks
Altitudinal distribution: submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus)
Note: a species related to or even identical with V. inaspecta, with a thin, epilithic, continuous to rimose-areolate, dark olivaceus thallus, hemispherically protruding ascomata (to 0.3 mm in diam.), an involucrellum adpressed to the perithecial wall and reaching the base of the perithecia, and ellipsoid ascospores (to c. 25 µm long); on schist, only known from the type locality at the base of the Western Alps (Italy).
Italy: Liguria;