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Data Set Maintenance: Data set standard item. Data set author(s): Clerc, P. (97-02-15). Data set to be published after submission; 97-02-15.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: species. Usnea. Parmeliaceae Zenker (1827).

Thallus: Anisotomic-dichotomous; erect or subpendulous, branches tapered; terete or applanate (moderately flattened); not segmented or segmented. Secondary Thallus: Trunk with intact wall, black. Thallus Size and Differentiation: 3-6 cm long; main branches basally constricted. Thallus Outline: Margin entire. Upper Surface: Matt; not fissurate or fissurate; fissures without extrusions; not foveate; without patches; not pseudocyphellate; cilia slender, laminal; isidiomorphs on immature soralia only or on mature and immature soralia, darker than the thallus; papillae subhemispherical; soralia broad, forming ab initio or eroding from the tip of tubercles, maculiform, prominent, slightly excavated, (10)-12-16-20-(26) per mm², isolated, not confluent with other soralia, emarginate or marginate; not tuberculate.

Secondary Metabolites: Stictic acid, constictic acid (when present, as minor compound), and norstictic acid (when present, as minor compound).

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