• Opegrapha paraxanthodes Nyl.
Opegrapha paraxanthodes
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Recorded only from west Galway this rare species of deep shade has a thin, greenish-yellow thallus which grows in the crevices of upland, base-rich rocks. The slit-like discs (lirellae) are like a smaller version of O. mougeotii (usually <1mm long v 1.5mm) and with shorter spores with fewer divisions (four- to five-septate v five- to seven-septate). O. varia is also similar, but has even larger discs, a less demanding habitat and a markedly different thallus colour.

Key characteristics

  • Thallus thin, greenish-yellow; lirellae < 1mm long, four- to five-septate
  • Crevices in base-rich rock in deeply shaded situations.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Opegrapha paraxanthodes Nyl.. [In] LichenIreland. Accessed on 2018-08-20.