• Arthonia lapidicola (Taylor) Branth & Rostr.
Arthonia lapidicola
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(Map updated: 11 August 2009)

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

 Simms, M. J., (2016). Arthonia lapidicola (Taylor) Branth & Rostr.. [In] LichenIreland. Accessed on 2019-01-20.