• Opegrapha herbarum Mont.
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Opegrapha herbarum
© Robert Thompson
Opegrapha herbarum
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(Map updated: 11 August 2009)

This crustose epiphyte of smooth, shady bark belongs to the ‘scripture lichens’ tribe. Although the thallus is faint, the discs (lirellae) are generally open and flat, the groove down the centre stretched almost to the margins. Generally, the discs are not frosted over with pruina. Under the microscope it will be seen to have three-septate spores and a broad, watery perispore.

Key characteristics

  • The comparatively large, wide slits of the discs help to distinguish this species
  • Microscopic examination and measurement of the three-septate spores is recommended in case of any doubt.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Opegrapha herbarum Mont.. [In] LichenIreland. Accessed on 2020-05-30.