• Opegrapha lithyrga Ach.
Opegrapha lithyrga
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Look for this silky-suave crustose species in narrow clefts and openings below sheltered siliceous rocks, especially along inland cliffs. It has a thin varnish-like, grey-brown to greenish thallus and attractive elongate discs (spores five- to seven-septate), each a snake-like slit. It is light-intolerant and so is often found in the company of other photophobic taxa such as Enterographa hutchinsiae.

Key characteristics

  • Shiny, varnish-like thallus in sheltered clefts of siliceous rock outcrops, sometimes mosaic-forming
  • Lirellae: attractive, serpent-like; spores 35m wide, five- to seven-septate.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Opegrapha lithyrga Ach.. [In] LichenIreland. Accessed on 2018-08-14.