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 Data set author(s): Esslinger T. Data set not to be published after submission.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

Biogeography: Continent: Asia-Temperate, Europe, Northern America, and Southern America. Checklist records: Sonoran Desert and United States and Canada (continental).

Ecology: Bryophytic, lignicolous, or corticolous; substrate non-calciferous or calciferous.

Thallus: Foliose, lobed; lobes linear; rounded (irregular) at the front; plane (only weakly concave or convex); separate thallus parts 1-2 mm wide. Thallus Size and Differentiation: Up to 5 cm in diameter; apex not curved. Upper Surface: Grey, brown, or brownish red; pruinose; pruina scarce or abundant; continuous or patchy (sometimes only on lobe ends); without hairs; not isidate; sorediate; soralia grey or grey-brown (darkening with age), terminal, labriform, isidiate, soredia coarse. Lower Surface: Black (sometimes in oldest parts) or brown in the centre, white (with obscure black striations (individual hyphae)) along the margin; rhizinate; rhizines moderately abundant, black, branched, squarrosely branched.

Upper Cortex: Outer cortical layer scleroplectenchymatous. Medulla: White. Lower Cortex: Absent or present; prosoplectenchymatous (missing at periphery, usually organizing inward), of periclinal (missing at periphery, usually organizing inward) hyphae.

Reproduction Strategy: Usually only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Up to 2 mm in diam.. Margin: Lobulate (lobules may develop labriform soralia on ends), smooth.

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