Description: B. egenula is one of several Bacidia species that colonises shaded calcareous rock. It will also colonise bark and fence post tops. The dull, yellow-green to pale brown granular thallus bears grey to brown-black discs (often with dark centres) with a green epithecium and a brown upper hypothecium.

Key Identification Features:

• Green granular thallus; discs brown-black, epithecium green, upper hypothecium brown
• Shaded rocks, sandstone, fence posts.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Bacidina egenula at iNaturalist World Species Observations database.