• Arthonia diploiciae Calat. & Diederich 

There are no records for this species at present.

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This lichenicolous lichen is parasitic on the thallus of Diploicia canescens. The host thallus develops a tight speckling of discs so causing visible brown spots to appear on the surface. The four-spores asci at once distinguish it from other species of the genus. In Ireland, it appears to occur only in western counties.

Key characteristics

  • Clusters on minute black spots on Diploicia canescens
  • Four-spored asci.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Arthonia diploiciae Calat. & Diederich . [In] LichenIreland. Accessed on 2018-08-19.