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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	Soralia oblong-cylindrical; contains barbatic acid (as a main substance) and salazinic acid (as an accessory)
	Young soralia punctiform, later becoming rounded; contains norstictic acid (as a main substance) and salazinic acid (as an accessory)

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