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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: Isotomic-dichotomous; erect, branches tapered; terete; not segmented. Secondary Thallus: Trunk with intact wall, black. Thallus Size and Differentiation: 2-15 cm long; main branches basally not constricted. Thallus Outline: Margin entire. Upper Surface: Matt; not fissurate; fissures without extrusions or with extrusions, transversely oriented oriented; not foveate; without patches; not pseudocyphellate; cilia slender, laminal; without isidiomorphs; papillae verrucose; not sorediate; not tuberculate.

Upper Cortex: (7)-9-12-(17) % of thallus width. Medulla: (4)-10-21-(27) % of branch width, dense or compact; (27)-39-53-(71) % of thallus width, solid.

Ascocarps: Forming directly at the tip of the thallus parts or close to the the tip of the thallus parts, abundant (rarely few or absent).

Secondary Metabolites: Alectorialic acid (when present, only in apothecia), atranorin, bourgeanic acid, diffractaic acid, squamatic acid, and thamnolic acid.

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