Lichen: Usnea florida
Conservation Evaluation: Least Concern
Body Type: Fruticose
Description: The thallus is green-grey, large bushy and densely branched reaching sizes of 5 to 10cm. The base is blackened, the main stem rather thick with thinner and contorted side branches. Apothecia form at the tips of the branches and are usually abundant and conspicuous. Many reach diameters of 5 to 10mm. The discs are smooth in texture and flat to concave in shape and are fringed with long and sometimes branched eyelash-like cilia. Isidia and soralia are charastically absent (distinguishing it from U. subfloridiana). Spines (< 10mm) and wart-like growns form along the main stem.
Chemical Tests: K+ deep yellow on the medulla, Pd+ orange.
Nature Notes: Very sensitive to SO2 pollution. Found in well-lit situations, typically in the canopy of broadleaved woodlands. Sometimes found on fence posts. Never found on the bole of trees. Occasionally found on wind-fall twigs. Rare in Ireland.
Vice county distribution map: See Map
Link: Map this species on the Lichen Survey
Other species recorded in Ireland:
- Usnea articulata (L.) Hoffm.
- Usnea ceratina Ach.
- Usnea cornuta Körb.
- Usnea esperantiana P.Clerc
- Usnea filipendula Stirt.
- Usnea flammea Stirt.
- Usnea fragilescens Hav. ex Lynge 
- Usnea fragilescens var. mollis (Vain.) Clerc
- Usnea fulvoreagens (Räsänen) Räsänen
- Usnea glabrata (Ach.) Vain.
- Usnea glabrescens (Nyl. ex Vain.) Vain.
- Usnea hirta (L.) F.H.Wigg.
- Usnea rubicunda Stirt.
- Usnea subfloridana Stirt.
- Usnea wasmuthii Räsänen
- Usnea wirthii P.Clerc
Text and images © Paul Whelan, 2009.