Description: This is a pioneer, crustose lichen occurring mostly on artificial habitats such as concrete, and on limestone walls. Although the thallus is barely visible, the tiny (to 1.5mm diam.) chestnut-coloured discs (blacker when dry) iced with a net of pruina, are distinctive. Even when the pruina appears to have been removed, some of the discs or the darker disc edge (exciple) will carry evidence of it. It is relatively common on suitable substrates throughout Ireland.

Key Identification Features:

• The lack of an obvious thallus, and the chestnut-brown fruits with a darker margin which are frequently iced with pruina giving the disc a bluish hue should confirm this species
• Common on man-made substrata such as old mortar and the tops of concrete posts.

Original text submitted by Simon Davey

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

iNaturalist: Sarcogyne regularis at iNaturalist World Species Observations database.