• Lecidea fuscoatra (L.) Ach.
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Lecidea fuscoatra
© Mike Simms
Lecidea fuscoatra
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(Map updated: 11 August 2009)

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This is a lichen of smooth-topped, nutrient-enriched acid rocks in the uplands; also drystone walls and old brick walls in towns. The thallus is cracked like dry mud into numerous, red-brown pieces (areoles), the whole surrounded by a black line (prothallus). The glazed-over black discs are sunken into the areoles, so lie flat on the surface. It is common on suitable habitats throughout Ireland. A dab of fresh bleach can turn the thallus red.

Key characteristics

  • The cracked, lizard-skin-like areolate thallus that is pale red-brown with a black prothallus helps to identify this species
  • The frosted-over discs are immersed in the thallus that reacts C + red.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Lecidea fuscoatra (L.) Ach.. [In] LichenIreland. Accessed on 2018-07-19.