• Acarospora rufescens (Ach.) Kremp.
Acarospora rufescens
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Like A. smaragdula (described elsewhere) but with a wide-spreading, smooth, evenly-cracked crust (K-) thinning towards the margin (never lobe-like), of dull or dark brown colour. Discs deeply concave. Look for it on sandstone or other coarse-grained siliceous rocks.

Key characteristics

  • Smooth, dark brown, wide-spreading evenly-cracked thallus (K-)
  • Discs deeply concave; on gritty, acid rock.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Acarospora rufescens (Ach.) Kremp.. [In] LichenIreland. Accessed on 2018-08-15.