Usnea in Europe

	Key to the Usnea species in Europe
	Identification key of 31 species, maximum length – 37 steps

	select one of the choices
	Base pale, basal part often with distinct annular cracks; contains stictic acid (as a main substance)
	Base black, often with transverse fissures but without annular cracks; contains other (besides stictic acid) medullary substances

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	Species in the key articulata \| barbata \| cavernosa \| ceratina \| chaetophora \| cornuta \| dasaea \| dasypoga \| diplotypus \| esperantiana \| flammea \| flavocardia \| florida \| fragilescens \| fulvoreagens \| glabrata \| glabrescens \| hirta \| intermedia \| lapponica \| longissima \| mutabilis \| praetervisa \| rubicunda \| schadenbergiana \| silesiaca \| subcornuta \| subfloridana \| subscabrosa \| substerilis \| wasmuthii