Usnea in Europe  http://www.ut.ee/ial5/k2n/
key/usnea_eu/index.html
  • Usnea florida, base
  • Usnea florida, papillae
  • Usnea florida, apothecia
  • Usnea florida, medulla
  • Usnea florida & Marchantiomyces corallinus