• Pertusaria hemisphaerica (Flörke) Erichsen
Pertusaria hemisphaerica
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A crustose lichen of moderately rough tree bark in well-lit woodlands and open spaces, P. hemisphaerica forms sizeable patches of pale blue-grey thallus surrounded by a conspicuous broad white margin. Discs are absent. Search for it towards the base of mature trees where the large (1–2mm) C+ red, convex soralia should easily distinguish it. In Ireland, the species is thinly scattered throughout.

Key characteristics

  • Muted blue-grey thallus with a broad white margin
  • Discs unknown but thallus with hemispherical soralia that react C+ red.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Pertusaria hemisphaerica (Flörke) Erichsen. [In] LichenIreland. Accessed on 2018-08-20.