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(Map updated: 11 August 2009)

In appearance the thallus of this species is like L. lapicida (described elsewhere), but in L. plana spot tests are all negative. The consistently pale grey thallus, and discs remaining black when moist, separate it from L. lithophila (thallus with rusty patches). A section through the exciple (disc rim) shows up as yellow-grey. Siliceous rocks, more frequent in Northern Ireland.

Key characteristics

• Cracked, consistently grey crustose lichen, thallus K-; discs remaining black when moist, exciple in section yellow-grey
• Siliceous rock; a predominantly northern upland species.

NBN Atlas mapping: Species account : NBN Atlas UK Species Observations database

iNaturalist: Species account : iNaturalist World Species Observations database

Original text submitted by Vince J. Giavarini