• Bacidia egenula (Nyl.) Arnold
Bacidia egenula
Click on map to open large map in new window
(Map updated: 11 August 2009)

Click here to view an interactive map of the Northern Ireland dataset as currently collated by CEDaR.
The map is generated through the NBN Gateway using their Interactive Mapping Tool.


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 characteristics

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

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Bacidia egenula (Nyl.) Arnold. [In] LichenIreland. Accessed on 2018-08-21.