LichenIreland
  • Pyrenula macrospora (Degel.) Coppins & P.James
Pyrenula macrospora
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The wax-shiny, cream-yellow to olive brown, mosaic-forming thallus of this crustose lichen is spotted with tiny white spots alongside the characteristic, black-globose (to 1mm diam.), half-sunken discs (perithecia). When forming a lichen mosaic, the edge of this species is separated by a bold black margin. It is a very common sight on shaded, smooth-barked trees. Near settlements and towns it can be frequent on the dry side of mature trees in or around old graveyards and churches.

Key characteristics

  • Wax-like thallus densely and minutely white-spotted
  • Black-globose discs to 1mm diam. (the similar P. chlorospila has discs less than half the size).

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Pyrenula macrospora (Degel.) Coppins & P.James. [In] LichenIreland.
http://www.habitas.org.uk/lichenireland/species.asp?item=19902 Accessed on 2017-10-18.