• Rhizocarpon viridiatrum (Wulfen) Körb.
Rhizocarpon viridiatrum
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This is a parasitic species forming small patches among other lichens such as Aspicilia caesiocinerea. Although it is a yellow-coloured species and therefore easily overlooked for Rhizocarpon geographicum, the muriform spores are few-celled (five to nine), the epithecium brown-black and granular and the medulla I-. In Ireland, records are few; Counties Kerry and Cork.

Key characteristics

  • Thallus yellow, parasitic forming small patches
  • Spores muriform, few-celled, epithecium brown and granular.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Rhizocarpon viridiatrum (Wulfen) Körb.. [In] LichenIreland. Accessed on 2018-07-23.