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

Type Information: Basionym: Physcia undulata Moberg. Type: Physcia undulata Moberg.

Biogeography: Boreal (temperate, not boreal); coastal, colline, submontane, and montane. Continent: Northern America and Southern America. Checklist records: Mexico, Sonoran Desert, and United States and Canada (continental).

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

Thallus: Foliose, subdivided into main parts, lobed; lobes ascending; imbricate (somewat overlapping); separate thallus parts up to 2 mm wide; thin; up to.15 mm thick. Thallus Size and Differentiation: Up to 4 cm in diameter; apex curved upwards (undulating); rounded. Thallus Outline: Irregular or orbicular; soon disappearing. Upper Surface: Matt (frosted); immaculate; pruinose; pruina abundant; whitish; eciliate; without hairs; not isidate; sorediate; soralia peripheral, subapical; not blastidiate; not schizidiate; not lobulate. Lower Surface: Present, grey, white, or pale brown, loosely attached attached; attached by holdfasts (true rhizines); rhizinate; rhizines moderately abundant, grey (concolorous or darker than lower surface), brownish brown, or white, 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 prosoplectenchymatous or paraplectenchymatous (indistinctly). Medulla: White. Lower Cortex: Present.

Reproduction Strategy: Only known as sterile, asexually reproducing form (not seen in Sonoran specimens) or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, soon sessile or substipitate, sparse, up to 2 mm in diam.. Margin: Lecanorine, persistent, distinct; 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 single or forked above). Subhymenium: White. Hypothecium: White.

Ascospores: Physcia-type and Pachysporaria-type, c. 8 per ascus, ellipsoid, (15)-18-27-(33) µm long, (7)-8-11-(13) µm wide; septa present; transversally septate; 1-transversally septate; wall thickened at the septum, becoming pigmented, dark brown (at maturity) or middle brown.

Conidiomata: Absent resp. not observed (not seen in Sonoran specimens) or present; sparse.

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

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

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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