Description: This species grows on rocky seashores lapped by unpolluted waters. The first thing to notice is the blue-grey, knotted-granular thallus mixed up with isidia consolidated into a whole, like pebble-dashed concrete left to set. Discs (to 1mm diam.) are common, orange-brown with a conspicuous, notched margin. Spot reactions are negative but its presence in the vicinity of nutrient-enriched rock is worth noting. Throughout Ireland but rarer in the south-east.

Key Identification Features:

• Blue-grey thallus of knotted granules, set like concrete
• Discs orange-brown with margins notched; rocky, nutrient-enriched seashores.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Myriolecis poliophaea at iNaturalist World Species Observations database.