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Stigmatochroma Marbach

Data Set Maintenance: Data set standard item. Data set author(s): Marbach B. (01-01-17). Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 7. Stigmatochroma. Synonyms: Buellia; Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Type Information: Type: Stigmatochroma epimarta (Nyl.) Marbach.

Taxonomic Literature: Taxonomic notes: One character of the genus is the different chemistry of thallus an pruina of the apothecia. This can most times be seen macroscopically by the colours of the specimens. Marbach, B. 2000. Corticole und lignicole Arten der Flechtengattung Buellia sensu lato in den Subtropen und Tropen. - Bibl. Lichenol. 74: 1-384.

Ecology: Biotroph; lichenized; lignicolous or corticolous.

Lichen Photobionts: Primary photobiont present; chlorococcal.

Thallus: Crustose, not subdivided parts, rimose. Thallus Outline: Soon disappearing. Upper Surface: Grey, yellow, white, or grey-yellow; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, soon sessile. Wall: Carbonized only in parts, not fused. Margin: Distinct; external filaments absent. Exciple: Black or brown. Periphyses: Absent. Epithecium: Apical cells grey, yellow, or red. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Black, yellow, or brown.

Asci: Tholus thickened, amyloid, with non-amyloid wide axial body and divergent amyloid flanks towards apex; ocular chamber broad; dehiscence lecanoralean.

Ascospores: c. 8 to 12-16 per ascus, ellipsoid, (10)-18-19-20-(24) µm long, (0)-(ERROR: 4.54.5) 7-7.5-8-(9) µm wide, obtuse; septa present; transversally septate, 1-transversally septate, formed by the proper spore wall; wall thin, not thickened at the septum, not constricted where the septum meets the spore wall, dark brown or middle brown, in Lugol's Solution negative, wall not ornamented or ornamented.

Conidiomata: Absent resp. not observed (very difficult to find, because the colour (bright yellow) is difficult to on the thallus) or present; pycnidial; immersed to adnate.

Conidiogeneous Cells: Apical. Conidia: Bacilliform; microconidial, not branched; aseptate; cell wall hyaline.

Secondary Metabolites: Present, of the following substance class(es): ß-orcinol depsides, ß-orcinol depsidones, (anthra-)quinones, and xanthones.

(report generated 04.Okt.2007)

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