Description: This loosely attached, brown, leafy lichen is a common sight on siliceous rocks, boulders and scree in upland and mountain districts. The lobes — often with a metallic sheen — carry a fine tracery of white lines. Powdery material on the surface of the lobes (soredia) or rod-like projections (isidia), common in many other species, are here both absent. Reddish-brown discs are often present. It may occasionally be found on acid-barked trees.

Key Identification Features:

• The brown colour, combined with a lattice work of white lines on the lobes, serves to separate this similar species
• It lacks both isidia and soredia.

Original text submitted by Simon Davey

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

iNaturalist: Parmelia omphalodes at iNaturalist World Species Observations database.