LICHALP

Verrucaria subtruncatula B. de Lesd.

Lichenised. Poorly known taxon.

Substrate: calciferous rocks

Altitudinal distribution: montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies)

Note: a species resembling V. caerulea but with larger ascospores, a thin, whitish, rimulose thallus, innate ascomata with a truncate apex (to 0.5 mm in diam.), a dimidiate involucrellum, and oblong ascospores (even exceeding 30 µm in length); on calcareous stones at low elevations; rare throughout Europe, including the Alps.