• Micarea lithinella (Nyl.) Hedl.
Micarea lithinella
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The thallus of this species is pale and thin so it is just as well that it has the distinctive habitat of periodically flushed, semi-embedded pebbles and stones. A favourite place for it is alongside tracks by woodlands. It is a pioneer coloniser of damp siliceous rock fragments like Trapelia coarctata and Ionaspis lacustris. The tiny convex discs (0.150.4mm diam.) range from yellow to orange-brown. In Ireland, the species is extremely rare.

Key characteristics

  • Thin skin of thallus with tiny convex yellow to orange discs
  • Grows on the damp sides of half-buried pebbles on the slopes of moorland tracks regularly flushed with seepage water.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Micarea lithinella (Nyl.) Hedl.. [In] LichenIreland. Accessed on 2018-08-16.