• Porpidia rugosa (Taylor) Coppins & Fryday
Porpidia rugosa
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(Map updated: 11 August 2009)

This species of Porpidia is best known by its thick, grey-white, crumbly thallus with soralia that form lines in the cracks across the surface. Discs are rare, black, clustered often with a veil of pruina, like sprinkled icing sugar; medulla I-. Damp rocks, for example, lough edges, sea cliffs; ranging from high uplands to sea level. Rare in Ireland.

Key characteristics

  • Thallus grey-white, crumbly with swellings, uneven; discs black, rare
  • Soredia bursting onto the surface though cracks in the cortex; damp siliceous rock.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Porpidia rugosa (Taylor) Coppins & Fryday. [In] LichenIreland. Accessed on 2019-04-20.