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Data Set Maintenance: Data set compiled (from Sonoran Lichen Flora Vol.1). Data set author(s): Bungartz F. (02-02-07). Data set to be published after submission; February 2002.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Physcia phaea (Tuck.) J.W. Thomson. Physcia. Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Type Information: Basionym: Parmelia phaea Tuck. Type: Physcia phaea (Tuck.) J.W. Thomson.

Biogeography: Northern hemispheric; coastal, colline, submontane, montane, and upper montane. Continent: Europe and Northern America. Checklist records: Mexico, Sonoran Desert, and United States and Canada (continental).

Ecology: Biotroph; lichenized; saxicolous; episubstratic; growing sun-exposed or partially shaded; under conditions which are dry or moist.

Thallus: Foliose, subdivided into main parts, lobed; lobes plane; separate thallus parts 1 mm wide. Thallus Size and Differentiation: Up to (3) cm in diameter. Thallus Outline: Irregular or orbicular; soon disappearing. Upper Surface: Grey-brown or pale grey, rough (rugose); maculate; maculae irregular; pruina abundant; eciliate; without hairs; not isidate; not sorediate; not blastidiate; not schizidiate; not lobulate. Lower Surface: Present, white or pale brown; attached by holdfasts (true rhizines); rhizinate; rhizines sparse, black, grey, or white, without projections, not branched or branched (rhizines simple to sparsely furcate), sparsely furcate; not sorediate; not tomentose.

Upper Cortex: Present; outer cortical layer paraplectenchymatous; inner cortical layer prosoplectenchymatous. Medulla: White. Lower Cortex: Present.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, soon sessile to substipitate, abundant, up to 1.5 mm in diam.. Margin: Lecanorine, crenulate (when young), persistent, distinct; not isidiate; not ciliate; not hirsute. Disk: Plane; black or brown; sometimes pruinose, pruina white. Epithecium: With epithecium (simple or forked); apical cells subulate (clavate with dark brown cap), pale brown. Hymenium: White; not inspers. Interascal Hyphae: Scarcely branched (paraphyses simple or forked above). Subhymenium: White. Hypothecium: White; not inspers.

Ascospores: Physcia-type, c. 8 per ascus, ellipsoid, (15)-16.5-20-(21.5) µm long, (6.5)-7-9.5-(11) µm wide; septa present; transversally septate; 1-transversally septate; wall thickened at the septum, becoming pigmented, dark brown (at maturity) or middle brown.

Conidia: Bacilliform (not bacilliform but cylindrical); 4-6 µm long; 1 µm wide.

Secondary Metabolites: Present; throughout the thallus medulla (atranorin, zeorin and triterpenes), atranorin or hopane-6a,22-diol (with triterpenes), metabolite(s) of unresolved identity: present (triterpenes).

Spot Tests: Present reactions. Upper surface: K + deep yellow, C –, KC –, PD + yellow; cortex: KC + deep yellow, – medulla: K + yellow; C –, KC –, PD + deep yellow; soredia: K + deep yellow; KC –.

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