• Chaenotheca hispidula (Ach.) Zahlbr.
Chaenotheca hispidula
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(Map updated: 11 August 2009)

This ‘pinhead’ lichen has minuscule stalks (<1mm high) and a greenish-yellow dusting over the lower part of the disc head. The immersed thallus has no special colouring but will scratch orange with a fingernail; it is the only Chaenotheca in Ireland to do this. It grows in the crevices of dry, deciduous tree bark, often in good numbers, for example, old oaks, in dapple-shaded woods. Thinly scattered in the north and east, rare in western Ireland.

Key characteristics

  • Pretty ‘pin-lichen’ with green-yellow dusting of pruina on disc head
  • Stalks < 1mm high; immersed thallus, orange when scratched; forms colonies in crevices low down on bole of mature, dry, acid-barked trees.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Chaenotheca hispidula (Ach.) Zahlbr.. [In] LichenIreland. Accessed on 2020-05-30.