Usnea mutabilis

	*Usnea* mutabilis Stirt.


	Nomenclatural data
	Scott. Naturalist 6: 107 (1881).—Usnea marocana Motyka, Lich. Gen. Usnea Stud. Monogr., Pars Syst. 2(1): 359 (1937).
	Morphology
	For a detailed description, see Clerc (1994, 2007) and Clerc & Herrera-Campos (1997). Thallus shrubby to subpendent; base pale or brownish; fibrils present, sparse; papillae absent; soralia punctiform, flat or slightly tubercular; isidiomorphs numerous. Cortex thin, glossy; medulla thin, dense, wine red.
	Medullary chemistry
	Chemotype (1) with fatty acids of the murolic acid complex (K–, Pd–) as main compounds (Fos & Clerc 2000) is known in Europe; chemotype (2) with eumitrin A₂ as a main compound and fatty acids of the murolic acid complex and norstictic acid as accessories were recently reported from North America, Sonoran region (Clerc 2007).
	Remarks
	Morphologically and chemically closely related to Usnea hirta (Fos & Clerc 2000).
Click on images to see more!	Ecology and distribution
	Europe (map legend) Mainly corticolous, rarely saxicolous (Clerc & Herrera-Campos 1997), prefers humid sites. In Europe it is present in the Mediterranean region only (Fos & Clerc 2000). Reported in Europe: France, Italy, Portugal, Spain.

Species pages available 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