• Porina linearis (Leight.) Zahlbr.
Porina linearis
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This crustose species with small, black, spherical discs (perithecia: to 0.4mm diam.) often sunken into pits occurs mostly on hard limestone. The thallus, which scratches orange with a fingernail, is pink-grey to brown. The species is relatively common in Ireland on hard limestone rocks.

Key characteristics

  • The minute, black perithecia, the colour of the thallus, and its habitat, serve to suggest this species
  • Under the microscope, the consistently three-septate spores should help to confirm it.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Porina linearis (Leight.) Zahlbr.. [In] LichenIreland. Accessed on 2018-07-18.