• Gyalecta derivata (Nyl.) H.Olivier
Gyalecta derivata
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This bark epiphyte has tiny, dish-like (urceolate), orange-brown discs (0.2-0.3mm diam.) sometimes more heavily pigmented and grows on the wound tracks of old field or wayside trees. In Ireland it has a strong eastern distribution from north to south. The concave, rather fruit gum-like discs are immediately recognizable as Gyalecta, but the spindle-shaped, 11- to13-septate spores should confirm it as this species. Both G. truncigena and G. flotowii (both described elsewhere) have muriform spores.

Key characteristics

  • On the rain or wound tracks of old, field trees with fruit gum-like, orange-brown discs
  • Spores, spindle-shaped with 11 to 13 divisions (20-30m long); some specimens may have an occasional longitudinal division.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Gyalecta derivata (Nyl.) H.Olivier. [In] LichenIreland. Accessed on 2018-07-19.