Description: This rare rock-inhabiting lichen is known only from County Clare. The grey-brown thallus produces tiny black discs (0.5–1.1mm diam.) that squeeze up from between the areoles; spores approx. 10µm long). Other than a K+ faint yellow medulla reaction, the spot tests are negative; rock: schistose or similar.

Key Identification Features:

• A rather small member of the Lecidea tribe; thallus grey-brown, discs emerging from between the areoles
• Medulla K+ faint yellow.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Lecidea obluridata at iNaturalist World Species Observations database.