Description: This tiny lichen with minute (<1mm diam.), L. polytropa-like discs grows on coarse sandstone walls and monuments, often close to a source of base-rich run-off, for example, mortar, cement. The slightly shiny discs which are never green are smaller and paler than in L. polytropa and have grey rims surrounding pale brown centres on a greenish cracked thallus. Spot tests unhelpful. The spores are 3-4&

371;m wide. North of Ireland only.

Key Identification Features:

• Thallus scurfy greenish with very small, scattered, grey-brown discs sometimes densely compressed into angular shapes; spores never wider than 4ųm
• On sandstones near to base-rich run-off: bridges, headstones, monuments, etc.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Lecanora stenotropa at iNaturalist World Species Observations database.