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Data Set Maintenance: Data set compiled (from Sonoran Desert Lichen Flora Vol. 1). Data set author(s): Bungartz F. (02-02-22). Data set to be published after submission; February 2002.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Physcia sorediosa (Vain.) Lynge. Physcia. Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Type Information: Basionym: Physcia integrata var. sorediosa Vain. Type: Physcia sorediosa (Vain.) Lynge.

Biogeography: Subtropical. Continent: Southern America and Asia-Tropical (southeast). Checklist records: Mexico and Sonoran Desert (not reported from Sonoran Desert Region, but reported from adjacent East Mexico).

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

Thallus: Foliose, subdivided into main parts, lobed; lobes widening towards the apex, imbricate (usually overlapping); imbricate (usually overlapping); separate thallus parts up to 2 mm wide. Thallus Size and Differentiation: Up to 5 cm in diameter. Thallus Outline: Irregular or orbicular; soon disappearing. Upper Surface: Grey, white, or pale grey, glossy (shiny); maculate (distinct); maculae punctiform; rarely pruinose; pruina scarce; whitish; eciliate; without hairs; not isidate; not sorediate; not blastidiate; not schizidiate; not lobulate. Lower Surface: Present, black or grey (lobe tips), black in the centre, dark grey along the margin; attached by holdfasts (true rhizines); rhizinate; rhizines more or less abundant, black, without projections, not branched or branched (rhizines simple to sparsely branched), sparsely furcate; not sorediate; not tomentose.

Upper Cortex: Present; outer cortical layer paraplectenchymatous; inner cortical layer paraplectenchymatous (################). Medulla: White. Lower Cortex: Present.

Reproduction Strategy: Only known as sterile, asexually reproducing form (not seen in Sonoran material, but elswhere, not common) or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, soon sessile or substipitate, sparse, up to 2 mm in diam.. Margin: Lecanorine, crenulate, persistent (sometimes disintegrating into soredia), distinct; sorediate; not isidiate; not ciliate; not hirsute. Disk: Plane; black; epruinose or pruinose. 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 single or forked above). Subhymenium: White. Hypothecium: White.

Ascospores: Pachysporaria-type, c. 8 per ascus, ellipsoid, 20-26 µm long, 9-11 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: cylindrical); 4-6 µm long; 1 µm wide.

Secondary Metabolites: Present; throughout the thallus medulla (atranorin and zeorin), atranorin or hopane-6a,22-diol.

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

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