Description: This is a common lichen of freshwater rivers, streams and lakes not exclusively, but most often, on siliceous rocks. It is also extremely variable but the evenly-cracked, grey to brown thallus with small projecting discs (perithecia) is often sufficient to identify it. It is usually associated with the submerged rocks of river edges and lake margins.

Key Identification Features:

• Thallus non-gelatinous, grey grading into pale to dark brown, evenly cracked
• Areoles with small projecting discs; lake edges and amphibious zone of rivers.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Verrucaria aethiobola at iNaturalist World Species Observations database.