• Acrocordia gemmata (Ach.) A.Massal.
Acrocordia gemmata
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(Map updated: 11 August 2009)

This crustose epiphyte is well known to lichenologists and is one of the target species expected to be hunted down on rough ash bark. There is very little to it. A matt white or pale gauzy grey thallus dominates the area over which there is a liberal sprinkling of large, spherical discs (perithecia), these often broadening to 1mm across, mostly emergent but sometimes slightly hidden. In A. gemmata, the pore at the top of the disc called the ostiole, is drunkenly lopsided, though not always obviously so. It has been said there may be some confusion with Anisomeridium biforme, but I think not. Through a lens, that species is just a squib compared with this giant.

Key characteristics

  • Clean white (especially on ash) or gauzy-grey thallus with spherical discs to 1mm diam.
  • Discs with lopsided ostiole; tree boles mainly, ash and oak.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Acrocordia gemmata (Ach.) A.Massal.. [In] LichenIreland. Accessed on 2020-05-26.