• Opegrapha atra Pers.
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Opegrapha atra
© Robert Thompson
Opegrapha atra
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(Map updated: 11 August 2009)

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This common ‘scripture’ lichen has a smooth, crustose, pale grey thallus occupied by scores of small (1mm long), black, narrow discs (lirellae) each with a central slit. The discs grow together in dense clusters forming tight, circular colonies which can join to produce extensive mosaics. Widespread: smooth barked trees in hedgerows and woodland; also in churchyards and cemeteries.

Key characteristics

  • Forms circular colonies of black, densely packed discs (a mixture of small black dots and straight or crooked lines)
  • Mostly on smooth, shaded bark.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Opegrapha atra Pers.. [In] LichenIreland. Accessed on 2018-08-16.