• Ochrolechia subviridis (Hoeg) Erichsen
Ochrolechia subviridis
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This pale grey crustose lichen, typical of nutrient-enriched field trees is characterised by fine, cylindrical or branched isidia that sometimes spread to cover the entire surface of the thallus, thus producing a textured, grey crust. It is C+ orange to red. These tests should always be done using fresh bleach. Discs are uncommon. It is a frequent species on the mature bark of well-lit trees in Ireland.

Key characteristics

  • The patches of grey thallus packed with fine (<0.5mm diam.) isidia sometimes spreading to form a complete crust on wayside field trees should help separate it
  • It can be separated from Ochrolechia turneri and Phlyctis argena by the positive C reaction.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Ochrolechia subviridis (Hoeg) Erichsen. [In] LichenIreland. Accessed on 2018-07-17.