Description: 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 Identification Features:

• 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

Distribution Map from NBN: Pyrenula macrospora at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Pyrenula macrospora at iNaturalist World Species Observations database.