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Usnea cornuta Körb.

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: accepted or basionymous. Taxonomic rank: species. Usnea. Parmeliaceae Zenker (1827).

Biogeography: Continent: Asia-Temperate, Europe, Northern America, and Southern America.

Ecology: Corticolous; substrate non-calciferous (rarely on rocks).

Thallus: Anisotomic-dichotomous; erect, branches tapered; terete; not segmented or segmented. Secondary Thallus: Trunk with intact wall, dark brown, concolorous the branches. Thallus Size and Differentiation: 2-7 cm long; main branches basally constricted. Thallus Outline: Margin entire. Upper Surface: Glossy (shiny); not fissurate or fissurate; fissures without extrusions; not foveate or foveate; without patches; not pseudocyphellate; cilia spinulous, laminal; isidiomorphs on mature and immature soralia, darker than the thallus; papillae verrucose; soralia minute, forming ab initio or eroding from the tip of tubercles, erose, prominent, (15)-28-41-54-(71) per mm², confluent, but not fusing or fusing, emarginate; not tuberculate.

Upper Cortex: (3.5)-4.4-5.8-7.2-(9.5) % of thallus width. Medulla: (5.5)-27.1-31.6-36.5-(40.5) % of branch width, loose or dense; (12)-17.6-25-32.4-(44) % of thallus width, solid.

Reproduction Strategy: Only known as sterile, asexually reproducing form.

Secondary Metabolites: Constictic acid (when present, as minor compound), norstictic acid, protocetraric acid (when present, as minor compound), salazinic acid, and stictic acid.

(report generated 04.Okt.2007)

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