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(Map updated: 11 August 2009)

A common foliose lichen forming rounded, flat, shiny-grey patches on bark or stone. The overlapping lobes are criss-crossed with a network of white, raised lines or ridges (like the creases in folded paper) from which emerges a dull grey, granular mixture of fungal hyphae and algae (soredia). The square-ended lobes are anchored by rhizinae (root-like structures) which develop from the black underside.

Key characteristics

• Grey leafy lichen with a conspicuous reticulum of white lines
• Lobes never with surface warts or projections (isidia).

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