• Buellia griseovirens (Turner & Borrer ex Sm.) Almb.
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Buellia griseovirens
© Mike Simms
Buellia griseovirens
© Mike Simms
Buellia griseovirens
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(Map updated: 11 August 2009)

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This crustose species is mostly characteristic of old wooden fencing and twigs and branches of acid-barked trees. The thallus is usually sterile (without discs), grey, and is covered with ulcer-like dark green to blue-green soralia. Owing to the nature of the climate, the interior of Ireland has its field boundaries rarely fashioned from wood so weather-worn worked timber is in short supply. Picnic tables are today one of the best alternative habitats for it. B. griseovirens turns K+yellow to red. It is a much overlooked species.

Key characteristics

  • The grey, sterile thallus and scattered blue-green soredia reacting K+yellow to red should confirm it
  • It is most likely to be confused with Trapeliopsis flexuosa which is C+ red.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Buellia griseovirens (Turner & Borrer ex Sm.) Almb.. [In] LichenIreland. Accessed on 2018-08-20.