• Rinodina confragosa (Ach.) Körb.
Rinodina confragosa
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(Map updated: 11 August 2009)

This is a mosaic-forming species of coastal siliceous rock, especially sheltered vertical faces. It closely resembles the common cliff lichen Tephromela atra, with its white-grey warty thallus and black discs, which is unfortunate since it can often grow with it. On poorly colonised smooth rock faces, R. confragosa is conspicuous by its black, outwardly-spreading prothallus. In the field, the Pd+ yellow spot test helps separate it from Tephromela atra. Spores: one-septate with angular locules. In Ireland, the species is very rare.

Key characteristics

  • Thallus white-grey, Pd+ yellow surrounded by a black prothallus
  • Discs black; spores brown, one-septate, ellipsoid with jagged locules; vertical shaded acid rocks: coastal.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Rinodina confragosa (Ach.) Körb.. [In] LichenIreland. Accessed on 2019-08-19.