• Verrucaria margacea (Wahlenb.) Wahlenb.
Verrucaria margacea
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You will do best to search the edge of acid rivers and streams for this species. The brown, uneven, mottled non-gelatinous thallus produces its perithecial discs wrapped up in a conical outer layer (involucrellum) and a cuff of thallus. The spores are large, simple (2632mm diam.). In Ireland, the lichen is widespread but local, western Atlantic areas mostly.

Key characteristics

  • Brown, mottled thallus, never smooth or gelatinous when wet
  • Perithecia with an involucrellum and cuff of thallus (sometimes this peels away with age); spores large to 32mm diam.; lake margins and sides of rivers and streams.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Verrucaria margacea (Wahlenb.) Wahlenb.. [In] LichenIreland. Accessed on 2018-07-23.