• Micarea lignaria (Ach.) Hedl.
Micarea lignaria
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This light-grey crustose lichen with a thallus of convex granules (0.25mm diam.) is a common species of peaty habitats, acid soils, dry stone walls and rocks especially in upland districts. The discs are rounded and rather shiny blue-black to black. It is abundant in suitable habitats throughout Ireland.

Key characteristics

  • Where siliceous rocks occur, look out for this species. The bubbly thallus of convex granules stiffening into a crust and almost black, convex discs should distinguish it
  • This species occurs in two varieties, distinguishable using chemical tests. The var. lignaria reacts negatively with a dab of fresh bleach [known as (C) in lichenology circles], whereas the var. endoleuca turns yellow-orange.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Micarea lignaria (Ach.) Hedl.. [In] LichenIreland. Accessed on 2018-08-21.