• Fuscidea praeruptorum (Du Rietz & H.Magn.) V.Wirth & Vezda
Fuscidea praeruptorum
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(Map updated: 11 August 2009)

The pale brown thallus of this crustose lichen grows on gritty sandstone outcrops and boulders in upland areas. It forms small, uneven crusts easily hidden between the thalli of other species. The pale green to ochre soralia against the darker thallus is usually the most reliable field character for identification as this feature can be spot tested to give a C+ red reaction. It is also Pd+ yellow. Unlike other acid-rock-inhabiting Fuscidea species, it is not a true mosaic-forming species. In Ireland, it is generally rare and very thinly scattered.

Key characteristics

  • Thallus verrucose-warty, pale brown with scattered, green to ochre-coloured soralia, C+ red, Pd+ yellow
  • Siliceous rocks: gritty or conglomerate boulders, exposed sandstones and low-level outcrops.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Fuscidea praeruptorum (Du Rietz & H.Magn.) V.Wirth & Vezda. [In] LichenIreland. Accessed on 2019-01-16.