Usnea in Europe

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

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	Branches of uneven thickness, irregularly swollen, apical parts often sinuous; soralia punctiform and usually not expanding, bearing relatively tall isidia; contains salazinic acid (as a main substance) and accessory substances
	Branches of even thickness, narrowing towards the apices, not swollen or sinuous; soralia minute to expanded, bearing relatively small isidia; contains other (besides salazinic 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