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Lecanora excludens Malme

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).

Taxonomic Literature: Imshaug, H.A. & Brodo, I.M., Nova Hedwiga 12: 1-59 [45] (1966).

Biogeography: Continent: Europe.

Ecology: Corticolous.

Thallus: Not subdivided parts, rimose; separate thallus parts thin. Thallus Outline: Indistinct; soon disappearing; black. Upper Surface: Lemon (citrine) or pale grey, matt, smooth; epruinose; not sorediate.

Ascocarps: Soon sessile. Margin: Lecanorine or lecideine/biatorine, smooth or rough, not flexuose, excluded, indistinct to distinct, concolourous with the surrounding thallus or darker than the surrounding thallus; without a thin rim between disk and thalline margin. Disk: Plane, brown or dark brown, epruinose. Exciple: Not carbonized. Parathecium (proper excipulum): White, not inspersed with crystals. Amphithecium (thalline excipulum): Present; crystals small, abundant, dissolving in 10% KOH; photobiont abundant. Amphithecial Cortex: Absent, indistinct, pseudocortical, not basally widened; 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, broadly ellipsoid, (11)-11.5-13-16.5-(17) µm long, 7-9-10.5-(11) µm wide; wall thin, not ornamented.

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

Spot Tests: Upper surface: C –, PD –.

(report generated 04.Okt.2007)


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