• Tomasellia gelatinosa (Chevall.) Zahlbr.
Tomasellia gelatinosa
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This crustose epiphyte grows on the twigs and branches of shrubs and young trees, especially hazel. The thallus is almost reduced to a yellow-grey stain. Through a lens the discs (0.3-1.1mm diam.) are quite unique and resemble brown-black, pimpled fruit gums that have become squashed flat. Search for it on hazel in sheltered situations or around the loughs of the north and west of Ireland.

Key characteristics

  • The minute, multiple black projections on the brown-black, circular fruits growing on hazel bark are diagnostic
  • The spores are three-septate.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Tomasellia gelatinosa (Chevall.) Zahlbr.. [In] LichenIreland. Accessed on 2018-07-16.