• Arthonia stellaris Kremp. [1]
Arthonia stellaris
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In appearance, this smooth-bark species is probably closest to Arthonia elegans (described elsewhere), and several rare Arthonia species which possess the spore character of having an enlarged upper cell. The non-frosted discs are often star-shaped, with arm-like projections, but a microscope will be required to view the three-to-four-septate spores with a size range of 16-26ųm long. It occurs on hazel, holly, rowan and oak mainly. North and south-west Ireland.

Key characteristics

  • Similar to A. elegans but with star-shaped discs bearing arm-like projections; smooth-barked trees
  • The discs are never frosted over; spores in the range16-26ųm long with an enlarged upper cell.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Arthonia stellaris Kremp. [1]. [In] LichenIreland. Accessed on 2018-07-21.