LichenIreland
  • Trapelia placodioides Coppins & P.James
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Trapelia placodioides
© Mike Simms
Trapelia placodioides
© Mike Simms
Trapelia placodioides
© Mike Simms
Trapelia placodioides
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This creamy-white, crustose species only a few centimetres in size occurs frequently on siliceous rocks, including man-made structures. The thallus forms a tight crust with fine cracks across the surface from which powdery soredia arise giving the surface a faintly floury appearance. A dab of C (fresh bleach) will turn it red. The species is scattered in Ireland, and possibly under-recorded.

Key characteristics

  • The C+ reaction immediately suggests the genus Trapelia
  • The creamy colour and slightly greener soredia help to confirm this species.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Trapelia placodioides Coppins & P.James. [In] LichenIreland.
http://www.habitas.org.uk/lichenireland/species.asp?item=19109 Accessed on 2017-12-12.