Usnea subcornuta

	*Usnea* subcornuta Stirt.


	Nomenclatural data
	Scott. Naturalist 6: 107 (1881).
	Morphology
	Thallus shrubby to subpendent; lateral branches lightly constricted at the point of attachment, branches with annular cracks; base pale; fibrils present, scarce to abundant; soralia usually large, with numerous isidiomorphs. Cortex glossy; medulla loose, contains subcortically (under the cortex) an orangish pigment.
	Medullary chemistry
	Chemotype (1) with stictic (K+ yellow to red, Pd+ orange) and norstictic acids as main substances (Fos & Clerc 2000).
	Remarks
	Has been considered as a synonym of U. cornuta, however, Clerc (1987b) indicated that this is a distict species characterized by the presence of orange pigment under the cortex. Morphologically similar to Usnea flammea (Fos & Clerc 2000), probably belongs to the U. fragilescens aggregate.
Click on images to see more!	Ecology and distribution
	Europe (map legend) Corticolous, on deciduous trees (e.g. Quercus suber), mostly on exposed branches of young trees (Fos & Clerc 2000). A rare species, known in Europe from a few southern localities only. Reported in Europe: Portugal, Russia (Caucasus), 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