• Stereocaulon evolutum Graewe
Stereocaulon evolutum
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This tough, light grey, cushion-forming, richly branched, arching, rock and soil-inhabiting lichen is a familiar species in upland Ireland. In Stereocaulon stems (pseudopodetia) support a grey mass of coralloid branches called phyllocladia. In S. evolutum these are flattened as if hammered out by a silversmith with numerous similarly flattened finger-like lobes. The branches arch over the thallus like a splayed hand waiting to pounce. The thallus is KC + violet (a spot of KOH followed soon after by a spot of fresh bleach). Throughout Ireland.

Key characteristics

  • Grey and cushion-forming with flattened branches linked to finger-like tips arching up over a thallus (which can sometimes exceed 10cm diam.)
  • The thallus tests KC + violet; in S. vesuvianum the branches are not flattened and have dark grey spots at their centres.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Stereocaulon evolutum Graewe. [In] LichenIreland. Accessed on 2018-08-21.