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(Map updated: 11 August 2009)

This powder lichen has a cream thallus loose at the surface without tints of blue-grey and an obvious but never lobed or raised edge. Spot tests K± dirty orange, C± dirty orange, Pd+ yellow-dirty orange. On siliceous or calcareous rocks often in sheltered situations. L. eburnea occurs in similar situations, is always greener or blue-grey and is cleanly K+ yellow, C+ faint yellow or pink. In Ireland, there are a few scatter sites in the north.

Key characteristics

• Cream-coloured thallus, loosely structured, delimited, but edge not lobed or raised
• Spot tests: all with rather dirty reactions none bright or clear; shaded calcareous or siliceous rock.

Original text submitted by Vince J. Giavarini