Lichens : Lecanorales : ParmeliaceaeLichens

Usnea hirta (L.) F.H.Wigg.

Description: This rather squat and bushy, or tangled, or occasionally stringy and pendulous ‘beard lichen’, needs acid bark to thrive. The grey-green thallus grows to about 4cm (but it is usual to find it much shorter). The branches are irregular in cross-section and limp when moistened with water. The main stems like porcupine legs carry a host of projecting spine-like spinules. Spot tests are negative. In Ireland, the species is more common in the north, around Connemara and near Belfast, especially.

Key Identification Features:

  • Dense tufts of scraggy branches (often of different thicknesses)
  • Spot tests negative; branches thick with spinules; on acid bark and wood.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Usnea hirta at iNaturalist World Species Observations database.

 Giavarini, Vince J., Simms, Michael J., & Davey, Simon, 2026. Usnea hirta. (L.) F.H.Wigg.. [In] Lichen Ireland.
https://www.habitas.org.uk/lichenireland/species.php?item=19145. Accessed on 2026-11-12.