• Pertusaria polythecia (Taylor) Erichsen
Pertusaria polythecia
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(Map updated: 11 August 2009)

This rare endemic could be confused only with P. albescens var. corallina (described elsewhere). The thallus is made of columnar warts concealing two to five discs bursting only at the tips to produce soralia. Spot tests negative. It has been collected from mosses overgrowing rock and the bark of trees such as rowan. In Ireland, it is known only from two sites in County Kerry.

Key characteristics

  • Like P. albescens but with thallus of columnar warts on tree mosses
  • Warts break only at the tips to produce soralia.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Pertusaria polythecia (Taylor) Erichsen. [In] LichenIreland. Accessed on 2020-07-14.