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The map is generated through the NBN Gateway using their Interactive Mapping Tool.
This is one of the commonest lichens of calcareous stone and walls in almost all areas of the country. It can be recognised by a combination of chocolate-brown to black-coloured thallus and minutely cracked surface. The shiny, globose discs (perithecia) resemble tiny, black beads and lie half-immersed in the thallus. It is easily overlooked as a black stain or smear. Calcareous rock, concrete and mortar; rare on siliceous stone.
Original text submitted by Vince J. Giavarini