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Lichen: Acrocordia salweyi

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Acrocordia salweyii - note the empty pits with a black ring

Name: Acrocordia salweyi
Body Type
: Crustose
Conservation Evaluation: Least Concern
Description: The thallus is frequently immersed in the substrate. If not it appears off white to light brown. Usually smooth to slightly granular but it may also show cracking that starts at the oldest and thickest part of the thallus. The large and flat-topped spherical perithecia ( < 2mm) are semi-immersed (about a quarter to a half of the cup buried). Some fall out leaving a black-rimmed socket. Spores 20-35 x 10-15 μm.
Chemical Tests: Negative.
Nature Notes: Found on soft calcareous rock and mortar, especially on old walls. Distributed widely in Ireland and probably under recorded. Confusion: like Acrocordia macrospora (but more frequently on silica rocks) or Acrocordia conoidea (but perithecia not flattened).

Vice county distribution map: See map.

Vice county map: Acrocordia salweyii

Link: Map this species on the Lichen Survey

Other species recorded in Ireland:

  • Acrocordia conoidea (Fr.) Körb.
  • Acrocordia gemmata (Ach.) A.Massal.
  • Acrocordia macrospora A.Massal.

Text and images © Paul Whelan, 2010.