Description: This species is a member of the maritime lichen flora and should be searched for above the splash zone in dry crevices and on shaded rock surfaces out of the glare of the sun. The thin grey-mauve brown, slightly waxy thallus is sprinkled with prominent spherical black discs (perithecia), these often compressed or squashed at the tip and with a thickened base. Spores are small (11.5–14µm long) oblong, and sometimes squared off at the ends. The species is scattered in Ireland and most frequent along the western Atlantic coast.

Key Identification Features:

• Thallus thin grey or mauve-brown with conspicuous, rather squashed black discs; spores small and oblong
• On friable siliceous rocks (slates and schists) just above the maritime splash zone.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Verrucaria prominula at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Verrucaria prominula at iNaturalist World Species Observations database.