Description: 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 Identification Features:

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

Original text submitted by Vince J. Giavarini

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

iNaturalist: Parmelia sulcata at iNaturalist World Species Observations database.