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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 Data set not to be published after submission.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. 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: Asia-Temperate, Europe, and Northern America. Checklist records: Sonoran Desert and United States and Canada (continental).

Thallus: Foliose, lobed; lobes linear; rounded at the front; plane; separate thallus parts 1-2-(3) mm wide. Thallus Size and Differentiation: Up to 9 cm in diameter; apex not curved. Thallus Outline: Margin crenate. Upper Surface: Grey, brown, or grey-brown; pruinose (at least on lobe ends); pruina scarce or abundant (sometimes); continuous or patchy; without hairs; not isidate; sorediate; soralia brown or grey-brown, peripheral (marginal on lobes), linear (irregular laminal soralia sometimes developing in older thallus parts), sometimes isidiate, soredia coarse. Lower Surface: Black or brown in the centre, brown along the margin; rhizinate; rhizines moderately abundant or 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: Sparse, up to 3 mm in diam.. Margin: Lobulate; sorediate.

Secondary Metabolites: Not detected or sometimes present; throughout the thallus medulla (perhaps) or in soredia (or soralia), variolaric acid (occasional).

Spot Tests: Usually absent or very rarely present reactions. Cortex: KC –, – medulla: K – KC – soredia: K usually – or + deep yellow; KC usually – or + deep yellow.

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