Usnea in Europe

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

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	Medulla (and central axis) usually pink, C+ yellow; soralia at the top of raised tubercles; contains diffractaic acid (as a main substance) plus barbatic and squamatic acids (as accessories)
	Medulla wine red, C–; soralia flat or slightly tubercular; contains fatty acids (as main 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