• Ochrolechia tartarea (L.) A.Massal.
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Ochrolechia tartarea
© Mike Simms
Ochrolechia tartarea
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(Map updated: 11 August 2009)

The thickly-warted thallus of this species forms bold creamy crusts – like coloured chunks of ‘Anaglypta’ wallpaper – over rock surfaces, tree bark and soil. The large, saucer-shaped, orange-pink discs (5–8mm diam.) can be abundant or altogether absent. This is a non-sorediate species unlike its lookalike O. androgyna but occasionally the two get mixed up. The thallus of O. tartarea should react better in K and turn pale yellow; O. androgyna is K-. The species was once widely harvested to make dye. In Ireland, the species is widely scattered, but is nowhere common.

Key characteristics

  • Heavyweight crustose lichen; cream coloured warty thallus with orange-pink discs when mature
  • Non-sorediate; K+ pale yellow, C+ red.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Ochrolechia tartarea (L.) A.Massal.. [In] LichenIreland. Accessed on 2019-01-19.