Verrucaria crustificans (Servít) ined. (provisionally placed here, ICN Art. 36.1b)

Syn.: Amphoridium crustificans 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 silicicolous species recalling a poorly developed Placocarpus schaereri, with a thin, epilithic, whitish-pruinose, rimose to areolate thallus, 1-4 perithecia without involucrellum, immersed in the areolae (to c. 0.2 mm in diam.), and oblong to ovoid ascospores (to 20 µm long); only known from the type locality at the base of the Western Alps (Italy).
Italy: Liguria;