Lichens : Lecanorales : ParmeliaceaeLichens

Usnea ceratina Ach.

Description: This is a gritty-textured trailing species which hangs like streamers of old bootlaces from old established trees. The core of each branch has a pinkish tinge with the medulla testing K-, Pd-, and C+ yellow-orange. The hanging portion of the thallus is spotted with coarse white swellings which burst to release granular soralia. In Ireland, the species is thinly distributed.

Key Identification Features:

  • Pendulous, coarse to the touch; branches with a pale pink centre and C+ yellow-orange reaction
  • Soralia granular giving the cortex a roughened appearance.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Usnea ceratina at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Usnea ceratina at iNaturalist World Species Observations database.

 Giavarini, Vince J., Simms, Michael J., & Davey, Simon, 2026. Usnea ceratina. Ach.. [In] Lichen Ireland.
https://www.habitas.org.uk/lichenireland/species.php?item=19136. Accessed on 2026-11-12.