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Physcia dubia (Hoffm.) Lettau

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. Taxonomic rank: species. Currently accepted name Physcia dubia (Hoffm.). Physcia. Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Type Information: Basionym: Lobaria dubia Hoffm. Type: Physcia dubia (Hoffm.) Lett.

Biogeography: Northern hemispheric; montane (in the Sonoran Region) and upper montane. Continent: Europe, Northern America, and Southern America (cold temperate). Checklist records: Germany, Mexico, Sonoran Desert, and United States and Canada (continental).

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

Thallus: Foliose, subdivided into main parts, lobed; separate thallus parts up to 1 mm wide. Thallus Size and Differentiation: Up to (3) cm in diameter. Thallus Outline: Irregular or rarely orbicular; margin darkened the thallus centre; soon disappearing. Upper Surface: Grey (to cream) or pale grey, smooth; usually immaculate; usually epruinose; eciliate; without hairs; not isidate; sorediate; soralia terminal, labriform, erose (not unspecific but lip-shaped); not blastidiate; not schizidiate; not lobulate. Lower Surface: Present, pale grey or white; attached by holdfasts (true rhizines); rhizinate; rhizines black, grey, or white, without projections, not branched (rhizines simple to sparsely furcate), sparsely furcate; not sorediate; not tomentose.

Upper Cortex: Present; outer cortical layer paraplectenchymatous; inner cortical layer prosoplectenchymatous. Medulla: White. Lower Cortex: Present.

Ascocarps: Apothecioid, orbicular, soon sessile or substipitate, up to 2 mm in diam.. Margin: Lecanorine, persistent, distinct. 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.

Asci: Cylindrical; dehiscence lecanoralean (Lecanora-Type).

Ascospores: Physcia-type, c. 8 per ascus, ellipsoid, 16-24 µm long, 6-10 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 material, elsewhere rare); sparse.

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.

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

(report generated 13.Nov.2007)

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