• Micarea xanthonica Coppins & Tønsberg

There are no records for this species at present.

The powdery yellow-green thallus of this species is so distinctive when growing over mats of oceanic mosses or liverworts on wet or dry acid bark, it can become an immediate attention-grabber. A dab of bleach producing a C+ persistent orange reaction is the clincher. Currently, there are records from Counties Wicklow, Mayo (west), Fermanagh and Donegal (west).

Key characteristics

  • Thallus conspicuous and eye-catching, powdery-granular, yellow-green on leached acid bark, often overgrowing mosses and liverworts
  • Tests C+ KC persistent orange, never fleeting.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Micarea xanthonica Coppins & Tønsberg. [In] LichenIreland. Accessed on 2020-07-06.