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Lecanora expersa 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: basionymous or accepted. Taxonomic rank: species. Lecanora. Lecanoraceae Körb. (1855).

Biogeography: Continent: Europe.

Ecology: Lignicolous or corticolous.

Thallus: Not subdivided parts, rimose; separate thallus parts thin. Thallus Outline: Indistinct; soon disappearing. Upper Surface: Lemon (citrine) or pale grey, matt, smooth or rough; epruinose; sorediate; soralia (.4)-.5-.7-1 mm in diam., grey or lime green, isolated, not confluent with other soralia, soredia coarse, 45-45-45 µm in diam..

Upper Cortex: Gelatinized.

Ascocarps: Soon sessile. Margin: Lecanorine, verrucose or verruculose, smooth or rough, not flexuose, persistent, indistinct to prominent, concolourous with the surrounding thallus; without a thin rim between disk and thalline margin. Disk: Plane, brown or grey-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, 15-20-30-(35) µm wide, not basally widened, 15-20-30-(35) µm wide at the base; inspersed with oil droplets. Episamma: Soluble in KOH. Epithecium: Apical cells slightly swollen, hyaline or brownish red, soluble in 10% KOH. Hymenium: Not inspers. Hypothecium: White; not inspers.

Ascospores: c. 8 per ascus, ellipsoid, (8)-8.5-9-10.5-(11) µm long, (4)-4.5-5-5.5 µm wide; wall thin, not ornamented.

Secondary Metabolites: Atranorin and roccellic acid, of the following substance class(es): orcinol depsides and (higher) aliphatic acids.

Spot Tests: Upper surface: C –, PD –.

(report generated 04.Okt.2007)


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