• Ochrolechia tartarea (L.) A.Massal.
Click on the image to enlarge it in a new window
Ochrolechia tartarea
© Mike Simms
Ochrolechia tartarea
Click on map to open large map in new window
(Map updated: 11 August 2009)

Click here to view an interactive map of the Northern Ireland dataset as currently collated by CEDaR.
The map is generated through the NBN Gateway using their Interactive Mapping Tool.


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 2018-08-16.