LichenIreland
  • Arthonia lapidicola (Taylor) Branth & Rostr.
Arthonia lapidicola
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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 (4-7ųm 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 characteristics

  • 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