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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 or basionymous. Taxonomic rank: species. Currently accepted name Physcia nashii Moberg. Physcia. Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Biogeography: Subtropical; colline, submontane, and montane. Continent: Northern America. Checklist records: Mexico and Sonoran Desert.

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 widening towards the apex; plane or convex; separate thallus parts 1 mm wide. Thallus Size and Differentiation: Small; up to (5) cm in diameter; apex not curved (but curved downwards). Thallus Outline: Irregular or orbicular; margin lobulate (sometimes inner parts dissected into small lobes); darkened the thallus centre; soon disappearing. Upper Surface: Grey or pale grey, matt or glossy (shiny), smooth; maculae punctiform; pruinose or sometimes epruinose; pruina whitish; eciliate; without hairs; not isidate; sorediate; soralia terminal, semicapitate (sometimes big and reflexed), soredia more or less coarse; not blastidiate; not schizidiate; not lobulate. Lower Surface: Present, white (with a rose tinge); attached by holdfasts (true rhizines); rhizinate; rhizines sparse, white (concolorous or darker than undersurface), 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 (often labyrinthiform in lower parts). Medulla: White. Lower Cortex: Present.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, soon sessile or substipitate, sparse, up to 2 mm in diam.. Margin: Lecanorine, persistent, distinct; more or less sorediate; not isidiate; not ciliate; not hirsute. Disk: Plane. 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: Pachysporaria-type, c. 8 per ascus, ellipsoid, (14)-14.4-18.5-(20.5) µm long, 7.5-9-(9.5) 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 (triterpenes), atranorin (and traces of 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 – C –, KC –, PD – lower surface: K – soredia: K – KC –.

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