• Staurothele rupifraga (A.Massal.) Arnold
Staurothele rupifraga
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(Map updated: 11 August 2009)

This is a species of damp, sheltered limestone rock. The thallus is unlike most species of Staurothele in that it is superficial (epilithic), ivory or creamy-green or grey, with the spherical discs (perithecia) neatly immersed in pits in the rock. Within the disc the algae will be seen to be shortly oblong or as wide as they are long. A key feature of this species is the spores, which are dark brown at maturity and in groups of four or occasionally five per spore sac (ascus). It is uncommon on damp limestone except in the Burren, County Clare.

Key characteristics

  • Thallus: epilithic, green; perithecia in pits
  • Spores 4/ascus, brown, 4060m long; disc algae: barely oblong; on damp limestone (but never wet with seepage water).

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Staurothele rupifraga (A.Massal.) Arnold. [In] LichenIreland. Accessed on 2019-08-18.