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Physcia erumpens Moberg

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

Type Information: Basionym: Physcia erumpens Moberg. Type: Physcia erumpens Moberg.

Biogeography: Mediterranean and subtropical; submontane and montane (in the Sonoran Region). Continent: Northern America (Southwest) and Southern 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; substrate non-calciferous.

Thallus: Foliose, subdivided into main parts, lobed; not imbricate or imbricate (lobes overlapping to separate); separate thallus parts up to 1 mm wide. Thallus Size and Differentiation: Up to (3) cm in diameter; apex not curved. Thallus Outline: Irregular or orbicular; soon disappearing. Upper Surface: Grey, pale grey-brown, or pale grey, matt or glossy (shiny), smooth; immaculate; occasional epruinose or pruinose; eciliate; without hairs; not isidate; sorediate; soralia laminal, fully excavated; not blastidiate; not schizidiate; not lobulate. Lower Surface: Present, black (except for the tips), black in the centre, grey along the margin, firmly attached attached; attached by holdfasts (true rhizines); rhizinate; rhizines black, 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 paraplectenchymatous. Medulla: White. Lower Cortex: Present.

Ascocarps: Apothecioid, orbicular, soon sessile or substipitate. Margin: Lecanorine, crenulate, persistent, distinct; isidiate (not isidia but soredia). 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: Pachysporaria-type, c. 8 per ascus, ellipsoid, 21-27 µm long, 9-12 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 (zeorin not in cortical layer) or throughout the thallus medulla, atranorin 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 + deep yellow; soredia: K + deep yellow; KC –.

(report generated 13.Nov.2007)

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