• Trapelia involuta (Taylor) Hertel
Trapelia involuta
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This small, crustose lichen is a common species of upland, nutrient-enriched siliceous rocks and is characterised by its brown to pale pink discs. The thallus is formed from aggregations of shiny white or button-like squamules which gather into clumps that react C + red.

Key characteristics

  • The C+ red reaction immediately suggest a member of the genus Trapelia
  • T. coarctata which is similar is usually a continuous crust, never forming clumps.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Trapelia involuta (Taylor) Hertel. [In] LichenIreland. Accessed on 2018-07-22.