Usnea schadenbergiana Göpp. & Stein

Nomenclatural data
60. Jahresber. Schles. Ges. Vaterl. Cult.: 229 (1883).—Usnea elongata Motyka, Lich. Gen. Usnea Stud. Monogr., Pars Syst. 2(1): 411 (1937).—Usnea hesperina Motyka, Lich. Gen. Usnea Stud. Monogr., Pars Syst. 2(1): 383 (1937).—Usnea subgracilis Vain., Ann. Acad. Sci. Fenn., Ser. A 6: 7 (1915).—Usnea subplicata (Vain.) Motyka, Lich. Gen. Usnea Stud. Monogr., Pars Syst. 2(1): 558 (1937).
Morphology
For a detailed description, see Clerc (1997, 2007), Halonen et al. (1998) and Herrera-Campos et al. (1998) (also under the name U. hesperina). Thallus pendulous; base pale; branches even in thickness, slendering evenly towards the apices, without foveolae and/or ridges; distinctly segmented by annular cracks close to the base; fibrils present, often long and curved, sparse to abundant; papillae absent; soralia present, punctiform, slightly tuberculate, mostly immature and resembling pseudocyphellae; isidiomorphs small, on young soralia only. Cortex mat, relatively thick; medulla thin and compact; central axis thick.
Medullary chemistry
Chemotype (1) with protocetraric acid only (K+ yellow, Pd+ orange) occurs widely in Europe, North and South Americas, and Africa; chemotype (2) with stictic acid complex has been reported from Asia (Clerc 1997).
Remarks
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Ecology and distribution
Europe (map legend)
Corticolous on deciduous (e.g. Laurus, Quercus) or coniferous trees (Picea, Tsuga), rarely on rocks (Halonen et al. 1998, Herrera-Campos et al. 1998). Reported in Europe: France, Slovenia.