Placidium savonicum (Servít) ined. (provisionally placed here, ICN Art. 36.1b)

Syn.: Involucrocarpon savonicum Servít
Lichenised. Poorly known taxon.
Substrate: calciferous rocks
Altitudinal distribution: submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus)
Note: a species with a verrucose to squamulose, brown thallus consisting of areoles and squamules (to 0.5 mm in diam.) with free, slightly elevated margins, lower cortex not developed, ascomata not protruding, visible only by the dots of the ostioles (c. 0.1 mm in diam.), a thin, entire involucrellum, and oblong ascospores (to c. 22 µm long); on calcareous rocks; only known from the type locality in Italy.
Italy: Liguria;