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Lecanora praepostera Nyl.

Data Set Maintenance: Data set standard item. Data set author(s): Lumbsch H. T. & Guderley R. (98-09-01). Data set to be published after submission; 98-09-01.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Lecanora. Lecanoraceae Körb. (1855).

Biogeography: Continent: Africa and Europe.

Ecology: Substrate non-calciferous.

Thallus: Not subdivided parts, rimose or areolate (primarily areolate); separate thallus parts thin or thick. Thallus Outline: Indistinct; black. Upper Surface: Verruculose, lemon (citrine), orange, pale grey, or grey, matt, smooth; epruinose; not sorediate.

Upper Cortex: Gelatinized.

Ascocarps: Becoming adnate to soon sessile, not constricted at the base. Margin: Lecanorine, verruculose, smooth, not flexuose or slightly flexuose, persistent, indistinct to prominent, concolourous with the surrounding thallus or darker than the surrounding thallus; without a thin rim between disk and thalline margin. Disk: Plane, dark brown, epruinose. Parathecium (proper excipulum): White, not inspersed with crystals. Amphithecium (thalline excipulum): Present; crystals small, not dissolving in 10% KOH; photobiont abundant. Amphithecial Cortex: Present, distinctly developed, eucortical, (10)-15-20.3-30 µm wide, not basally widened, (10)-15-20.3-30 µm wide at the base; inspersed with oil droplets. Episamma: Without episamma. Epithecium: Apical cells not swollen, hyaline or dark green, cell pigment reacting with 10% KOH. Hymenium: Not inspers. Hypothecium: White; not inspers.

Ascospores: c. 8 per ascus, ellipsoid, 10-12.5-15 µm long, (4)-4.5-6.5-8.5-(9) µm wide; wall thin, not ornamented.

Secondary Metabolites: Atranorin and norstictic acid, of the following substance class(es): orcinol depsides and orcinol depsidones.

Spot Tests: Upper surface: C –, PD –.

(report generated 04.Okt.2007)


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