• Collemopsidum caesium (Nyl.) Coppins & Aptroot (2008)
Collemopsidum caesium
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This lichen has a mostly buried thallus with just a fine brown mottling visible; algae yellow or blue-green. The discs spherical (perithecia), flat at the centre, not sunken, up to half-immersed. Not in pits. Spores 2030 x 8.512m, one-septate, lower cell narrowed like an inverted and stretched acorn. It grows on damp limestone and flushed base-rich schistose rocks. It is known from north-west Burren, County Clare.

Key characteristics

  • Tiny lime-loving lichen with yellow or blue-green algae, flattened perithecia and acorn-shaped, one-septate spores
  • On flushed rock such as limestone or schist.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Collemopsidum caesium (Nyl.) Coppins & Aptroot (2008). [In] LichenIreland. Accessed on 2018-07-20.