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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 convexella Moberg. Physcia. Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

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

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

Thallus: Foliose, subdivided into main parts, lobed; lobes widening towards the apex; plane; sometimes imbricate; separate thallus parts up to (1) mm wide. Thallus Size and Differentiation: Up to (2) cm in diameter; apex truncate. Thallus Outline: Sometimes irregular or orbicular; margin darkened the thallus centre. Upper Surface: Grey, white, or pale grey, glossy (shiny), smooth; maculate; pruinose; pruina scarce; whitish; eciliate; without hairs; not isidate; not sorediate; not blastidiate; not schizidiate. Lower Surface: Present, white (with a rose tinge); attached by holdfasts (true rhizines); rhizinate; rhizines sparse, white (to pale rose, concolorous with thallus undersurface), not branched or branched (rhizines simple to sparsely furcate), sparsely furcate.

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: Orbicular, soon sessile or substipitate, abundant, up to 2 mm in diam.. Margin: Lecanorine, crenulate, persistent, distinct or prominent; not isidiate; not ciliate; not hirsute. Disk: Plane; black or 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, not or scarcely anastomosed. Subhymenium: White. Hypothecium: White; not inspers.

Ascospores: Physcia-type and Pachysporaria-type, c. 8 per ascus, ellipsoid, 15-18 µm long, 7.5-8 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; only in the upper part of the cortex, atranorin (and triterpenes).

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

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