• Opegrapha niveoatra (Borrer) J.R.Laundon
Opegrapha niveoatra
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(Map updated: 11 August 2009)

Together with Opegrapha vulgate, this is one of the smallest of the common ‘scripture’ lichens. However, the discs (lirellae) are much smaller (0.3-1.0mm long) and it grows on trees with a more basic bark such as ash, sycamore or elm. The thin, grey to olive-brown thallus is sprinkled with discs that at first are just a slit, but later widens more with age. Eastern Ireland, rarer in the west.

Key characteristics

  • On basic-barked trees; it has extremely small lirellae (often <1mm in length)
  • Little dots occur with the discs that contain conidia that are worm-like, not sickle-shaped, or bacteria-shaped, as in O. vulgata.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Opegrapha niveoatra (Borrer) J.R.Laundon. [In] LichenIreland. Accessed on 2019-01-19.