Notes on the genus Usnea (lichenized Ascomycota, Parmeliaceae) IV
2016
Clerc, Philippe
Several species of the genus Usnea occurring supra-continentally are treated. Usnea barbata is new to the United Kingdom. Usnea entoviolata is new to Europe and a map of its known worldwide occurrence is given. Usnea perhispidella (syn. nov: U. eumitrioides), U. poliotrix, and U. subdasaea are new to North America. Usnea perplexans, a Himalayan taxon, is the correct name for U. lapponica, a widely occurring species in Europe and North America. Usnea aciculifera, U. hondoensis and U. pangiana are also discussed.
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