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(Map updated: 11 August 2009)

Where the mortar of walls is old and crumbly the much contracted, thick and gristly thallus of this poorly understood species should be looked for. The olive green to red-black shiny surface, turned-down edges of the thick lobes, and numerous granular isidia should help to identify it. Discs are rare, but when present are surprisingly plentiful. Under-recorded: Counties Donegal, Antrim and Kerry only.

Key characteristics

• Thallus olive green to black, shiny with thick lobes turned down at the edges
• Isidia granular or globose when wet; calcareous soils and crumbly walls.

Original text submitted by Vince J. Giavarini