• Arthonia leucopellaea (Ach.) Almq.
Arthonia leucopellaea
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(Map updated: 11 August 2009)

Rare in Ireland and restricted to the Kerry woodlands, this small, crustose epiphyte has a scurfy grey-white thallus (sometime slightly pinkish) scattered with tiny, lobate discs, like black, paw prints, finely veiled with pruina. The spores are three- to four-septate and lacking an enlarged upper cell. It is an acid-tree bark species. On holly in Ireland but also likely to occur on birch, oak and pine.

Key characteristics

  • Scurfy or snowy-grey thallus with tiny black, nodulose-lobed discs
  • Discs with a fine white frosting, spores three- to four-septate; holly in ancient woodland.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Arthonia leucopellaea (Ach.) Almq.. [In] LichenIreland. Accessed on 2018-12-18.