• Lecidea plana (J.Lahm) Nyl.
Lecidea plana
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In appearance the thallus of this species is like L. lapicida (described elsewhere), but in L. plana spot tests are all negative. The consistently pale grey thallus, and discs remaining black when moist, separate it from L. lithophila (thallus with rusty patches). A section through the exciple (disc rim) shows up as yellow-grey. Siliceous rocks, more frequent in Northern Ireland.

Key characteristics

  • Cracked, consistently grey crustose lichen, thallus K-; discs remaining black when moist, exciple in section yellow-grey
  • Siliceous rock; a predominantly northern upland species.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Lecidea plana (J.Lahm) Nyl.. [In] LichenIreland. Accessed on 2018-07-22.