LichenIreland
  • Placopsis lambii Hertel & V.Wirth
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Placopsis lambii
© Mike Simms
Placopsis lambii
© Mike Simms
Placopsis lambii
© Mike Simms
Placopsis lambii
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(Map updated: 11 August 2009)
Placopsis lambii
© Mike Simms
Placopsis lambii
© Mike Simms
 

This lichen of damp, siliceous, upland rocks and fast-flowing acid streams is a conspicuous, grey or pinkish-brown crustose species with closely attached, radiating margins giving the thallus a rosette-like appearance. In rather lively, wet situations alongside rivers it is found only with soralia which are greenish-brown, most often seen as large fleck-like scars on the surface of the lobes. In drier sites, it may have brown, scab-like structures (cephalodia) which tend to lie at the centre of the thallus. The pink or yellowish discs (0.8-1.6mm) are occasional. It is a lichen of the transitional or damp zone of a river. Throughout Ireland. All previous records of P. gelida are believed to belong here.

Key characteristics

  • A grey-brown crustose lichen with radiating lobes pocked with ulcer-like soralia; damp or wet places on upland siliceous rocks
  • At drier sites, the thallus may have brown, scab-like cephalodia and thick-rimmed, pinkish discs.

Original text submitted by Vince J. Giavarini

 
 Simms, M. J., (2016). Placopsis lambii Hertel & V.Wirth. [In] LichenIreland.
http://www.habitas.org.uk/lichenireland/species.asp?item=39710 Accessed on 2018-10-22.