Description: This common bark lichen forms yellow-green or lemony-yellow, powdery patches. The consistency of the powder (soredia) is as if sifted through a fine mesh, so is never granular or gritty. Discs are infrequent, very small and only slightly pinker than the thallus. A dab of fresh bleach applied with the tip of a toothpick will turn the thallus orange.

Key Identification Features:

• Powdery soredia is very fine and never gritty
• Fresh bleach turns the colour of the thallus orange.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Lecanora expallens at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Lecanora expallens at iNaturalist World Species Observations database.