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Data Set Maintenance: Data set authentic and standard item. Data set author(s): Esslinger T. (99-11-18). Data set not to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Physconia. Physciaceae Zahlbr. (1898).

Taxonomic Literature: Esslinger, T., Mycotaxon 51: 91-99 (1994); Moberg, R., Symb. Bot. Upsal. 22 (1): 1-108 (1977); Poelt, J., Nova Hedwigia 12: 107-135 (1966).

Biogeography: Continent: Europe and Northern America. Checklist records: Sonoran Desert and United States and Canada (continental).

Ecology: Lignicolous or corticolous; substrate non-calciferous (also occurs on mosses over rock) or calciferous.

Thallus: Foliose, lobed; lobes linear or flabellate; concave (occasionally somewhat) or plane; separate thallus parts.5-2-(3) mm wide. Thallus Size and Differentiation: Up to 6.5 cm in diameter; apex not curved. Thallus Outline: Margin crenate. Upper Surface: Grey, brown, or grey-brown; pruinose; pruina scarce (sometimes patchy or only on lobe ends) or abundant; continuous or sometimes patchy ((especially on lobe ends)); without hairs; not isidate; sorediate; soralia grey, brown, or brownish yellow, peripheral (marginal on lobes), linear (laminal soralia sometimes developing in older parts), isidiate, soredia coarse. Lower Surface: Black or brown in the centre, brown or pale brown along the margin; rhizinate; rhizines moderately abundant or sometimes abundant, black, branched, squarrosely branched.

Upper Cortex: Outer cortical layer paraplectenchymatous (but often small-celled and in some parts confusable as scleroplectenchymatous). Medulla: Yellow or white. Lower Cortex: Present; prosoplectenchymatous, of periclinal hyphae.

Reproduction Strategy: Usually only known as sterile, asexually reproducing form. Ascocarps: Sparse, up to 2.5 mm in diam.. Margin: Usually sorediate.

Secondary Metabolites: Present; throughout the thallus medulla or in soredia (or soralia), secalonic acid a.

Spot Tests: Present reactions. Cortex: KC –, – medulla: K – or nearly always + yellow; KC –, nearly always + yellow, or + orange; soredia: K –, more often + deep yellow, or + orange; KC –, more often + deep yellow, or + orange.

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