• Micarea subnigrata (Nyl.) Coppins & H.Kilias
Micarea subnigrata
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(Map updated: 11 August 2009)

This tiny crustose lichen occurs among larger mosaic-forming species on exposed, hard siliceous rocks in upland areas. The dark brown convex discs arise from a grey-brown warty thallus. In a squash section, the discs are seen to be brown above and colourless below. In Ireland, the species has been recorded from north-west Donegal but should be searched for on the acid outcrops of the south and east.

Key characteristics

  • Tiny, dark brown convex discs on exposed, hard siliceous rocks in the uplands
  • A simple squash of the disc will reveal a brown ‘upper’ layer above a colourless zone; there are no bright pigments present; Scoliciosporum umbrinum is similar but has spirally twisted, three- to five-septate spores.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Micarea subnigrata (Nyl.) Coppins & H.Kilias. [In] LichenIreland. Accessed on 2019-03-23.