• Usnea subfloridana Stirt.
Usnea subfloridana
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(Map updated: 11 August 2009)

This widespread grey-green ‘beard’ lichen becomes bushy and pendulous with age reaching 8cm or more in length. It is attached by a conspicuous black holdfast from which arise branches that are neither inflated nor annulated (broken by white rings). The branches are pimpled with minute, stump-like warts (papillae), some with clusters of isidia (minute rod-like structures containing fungal hyphae and algae) which when abraded may appear to be soredia (powdery outgrowths). It is a common lichen of well-lit trees, fences and rock outcrops.

Key characteristics

  • Blackened holdfast
  • Isidia, papillae and eroded areas sometimes all present, but branches not swollen, ringed or strongly covered in spiny outgrowths.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Usnea subfloridana Stirt.. [In] LichenIreland. Accessed on 2020-07-14.