Usnea in Baltic countries

	Key to the Usnea species in the Baltic countries
	Identification key of 16 species, maximum length – 17 steps

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	Branches often with foveolae or depressions; branching mainly anisotomic- dichotomous; contains salazinic acid (as a main substance)
	Branches without foveolae and depressions; branching mainly isotomic-dichotomous; contains norstictic acid or an unknown compound* (as a main substance)

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	Species in the key articulata \| barbata \| ceratina \| chaetophora \| dasypoga \| diplotypus \| florida \| fulvoreagens \| glabrata \| glabrescens \| hirta \| lapponica \| longissima \| subfloridana \| substerilis \| wasmuthii