• Porina borreri (Trevis.) D.Hawksw.& P.James
Porina borreri
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This epiphyte grows on the rough bark of oak, ash and sycamore and occasionally on old smooth bark. The green-brown to olive-black thallus produces numerous black spherical discs (perithecia) protected by a thick black involucrellum of cells. The perithecia contain six- to seven-septate spores. A section cut through the discs mounted in K shows the presence of purple pigments. In Ireland, the species is thinly scattered.

Key characteristics

  • Epiphyte of old smooth bark and rough basic-barked trees; perithecia (0.20.5mm diam.) black with a thick involucrellum containing K+ purple pigments
  • Spores six- to seven-septate.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Porina borreri (Trevis.) D.Hawksw.& P.James. [In] LichenIreland. Accessed on 2018-07-17.