• Lecidea lapicida (Ach.) Ach.
Lecidea lapicida
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This is a widespread species of acid, siliceous rock in the Irish uplands. It is most easily confused with Lecidea lactea and L. confluens but L. lapicida has a pale grey (never dark grey like L. confluens) crustose thallus and is K+ yellow (K+yellow-red in L. lactea and K- in L. confluens). The lichenicolous lichen Cecidonia umbonella grows on this species.

Key characteristics

  • Thallus K+ yellow, pale grey or slightly ferruginous, prothallus black, discs black (mostly 0.5-1.2mm diam.)
  • On acid rocks such as granite, quartzite and schist.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Lecidea lapicida (Ach.) Ach.. [In] LichenIreland. Accessed on 2018-07-22.