• Placynthiella uliginosa (Schrad.) Coppins & P.James
Placynthiella uliginosa
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(Map updated: 11 August 2009)

This common, dark brown to blackish, crustose species occurs mostly on the surface of sandy or peaty soils associated with heathy ground; it is also recorded from rotting wood. The thallus, which is C-, is seen as a dark brown crust of tiny spherical granules that turns green when moist. Discs are common, very often abundant. They are brown with a darker margin which is excluded as the disc matures and becomes convex. The species is restricted to the drier soils of eastern Ireland.

Key characteristics

  • The C- thallus, and spherical granules distinguishes it from most other similar species
  • The lookalike Placynthiella icmalea forms carpets of minute, soft brown, stick-like isidia over peaty soils and decaying wood and is C+ red.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Placynthiella uliginosa (Schrad.) Coppins & P.James. [In] LichenIreland. Accessed on 2019-01-16.