• Bacidia egenula (Nyl.) Arnold
Bacidia egenula
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(Map updated: 11 August 2009)

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 2019-01-19.