• Opegrapha niveoatra (Borrer) J.R.Laundon
Opegrapha niveoatra
Click on map to open large map in new window
(Map updated: 11 August 2009)

Click here to view an interactive map of the Northern Ireland dataset as currently collated by CEDaR.
The map is generated through the NBN Gateway using their Interactive Mapping Tool.


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 2018-08-16.