Description: This lichen grows on exposed, coarse-grained siliceous rock near the coast. It resembles L. auriculata (described elsewhere) but the discs have a soft, matt appearance. It bleeds C+ carmine red when a section through the disc rim (exciple) is tested in the field. It is scattered in Ireland, but nowhere plentiful.

Key Identification Features:

• Thallus almost reduced to a stain, discs black, matt with rim C+ carmine red in section
• On coarse-grained granitic rocks: exposed cliffs, shoreline outcrops, etc.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Lecidea diducens at iNaturalist World Species Observations database.