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Data Set Maintenance: Data set compiled (Sonoran Desert Lichen Flora Vol.1). Data set author(s): Bungartz F. (02-02-01). Data set to be published after submission; February 2002.

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

Type Information: Basionym: Physcia cinerea Moberg. Type: Physcia cinerea Moberg.

Biogeography: Subtropical; upper montane. Continent: Northern America and Southern America. Checklist records: Sonoran Desert.

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

Thallus: Foliose, subdivided into main parts, lobed; lobes convex; not imbricate (distinctly discret and deeply divided). Thallus Size and Differentiation: Up to (3) cm in diameter. Thallus Outline: Sometimes irregular or orbicular; margin lobulate. Upper Surface: Grey (to very dark gary); maculate or immaculate (not or weakly spotted); maculae punctiform; epruinose; eciliate; without hairs; not isidate; not sorediate; not blastidiate; not schizidiate. Lower Surface: Present, brown or white, firmly attached attached; attached by holdfasts (true rhizines); not rhizinate; rhizines more or less abundant, brown (both 6 and 8: concolorous with underside) or white; not sorediate.

Upper Cortex: Present; outer cortical layer paraplectenchymatous; inner cortical layer paraplectenchymatous (with thick-walled, partly irregular cells, distinctly delimited from medulla). Medulla: White. Lower Cortex: Present.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Orbicular, soon sessile or substipitate, usually abundant, up to (1.5) mm in diam.. Margin: Lecanorine, crenulate, persistent, distinct or prominent; not isidiate; not ciliate; not hirsute. Disk: Black or dark brown; epruinose. Epithecium: With epithecium (simple or forked); apical cells subulate (clavate with dark brown cap), pale brown. Hymenium: White; not inspers. Interascal Hyphae: Scarcely branched. Subhymenium: White. Hypothecium: White; not inspers.

Ascospores: Pachysporaria-type, c. 8 per ascus; septa present; transversally septate; 1-transversally septate; wall apically thickened, subapically thickened, 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; only in the upper part of the cortex or throughout the thallus medulla, atranorin (and triterpenes) or hopane-6a,22-diol.

Spot Tests: Present reactions. Upper surface: K + deep yellow, C –, KC –, PD + yellow; cortex: KC + deep yellow, – medulla: K + yellow; C –, KC –, PD + red (yellow, not red); soredia: K + deep yellow; KC –.

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