• Psora lurida (Ach.) DC.
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Psora lurida
© Mike Simms
Psora lurida
© Mike Simms
Psora lurida
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Where natural limestone forms large tracts of land, narrow rock crevices and soily depressions are the habitats most likely to yield this species. Soil-inhabiting lichens are often squamulose and P. lurida is no exception, with overlapping, chestnut-brown scales, smooth-margined yet wavy-edged, forming a thick, uneven crust of jigsaw-like pieces. Discs are common, black or very dark brown, to about 1mm diam. Catapyrenium lichens have immersed discs (perithecia); Solenopsora holophaea is similar but occurs only on sea cliffs; it has discs with a rim, which is entirely lacking in mature discs of Psora. Inland on limestone and calcareous rocks. County Clare and north-west Ireland.

Key characteristics

  • Squamulose thallus on soily humus over limestone with chestnut-brown, uneven scales forming a thick, cracked crust
  • Discs black or brown with margins that disappear with age.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Psora lurida (Ach.) DC.. [In] LichenIreland. Accessed on 2018-07-16.