Description: The thallus of this scurfy crustose lichen is grey or olive-brown. Convex blackish discs (to 0.5mm diam.) containing the one-septate, slipper-shaped spores (4-7&

371;m wide) are common. On calcareous rocks, mortar, the stone surfaces lying directly below metal grilles on church windows and on loose stones. Few records: north-east Ireland and County Kerry.

Key Identification Features:

• • Scurfy grey-green patches on calcareous rocks and mortar; discs black, evenly spread
• Spores one-septate, slipper-shaped; wider than those of A. muscigena and with dark capitate apices to the paraphysoids (the filaments which separate the spore sacs (asci).

Original text submitted by Vince J. Giavarini

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

iNaturalist: Bryostigma lapidicola at iNaturalist World Species Observations database.