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Data Set Maintenance: Data set authentic and standard item. Data set author(s): Esslinger T. (99-11-17). Data set not to be published after submission.

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

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

Thallus: Foliose, lobed; lobes linear or irregularly flabellate; concave or usually plane; separate thallus parts.8-2 mm wide. Thallus Size and Differentiation: Up to 6-(8) cm in diameter; apex not curved. Upper Surface: Grey, brown, or grey-brown; pruinose; pruina usually abundant; often continuous or patchy; without hairs; isidiate; isidia laminal, submarginal, isolated; not sorediate. Lower Surface: White (or pale tan) in the centre, white along the margin; rhizinate; rhizines moderately abundant, black, branched, squarrosely branched.

Upper Cortex: Outer cortical layer scleroplectenchymatous. Medulla: White. Lower Cortex: Present; prosoplectenchymatous, of periclinal hyphae.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Moderately abundant, up to 3 mm in diam.. Margin: Lobulate; isidiate.

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