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(Map updated: 11 August 2009)

This tiny, though abundant, grey-green crustose lichen grows widely on siliceous rocks and walls. It forms very small (0.5-2.0cm diam.) areolate thalli covered with yellow-green to pale brown discs that can coalesce to form larger patches. Common: rocks and walls, also on worked timber in remoter areas and along the coast.

Key characteristics

• Small patches, with scattered or crowded yellow-green discs
• Discs never emerald green on a thick crust.

Original text submitted by Vince J. Giavarini