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Syncesia Taylor (1836)

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Tehler A. (95-11-27) and Scholz P. (02-05-17); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 17 (A. Aptroot 99-09-27). Syncesia. Genus of unknown placement (incertae sedis); Arthoniales.

Type Information: Type: Syncesia albida Taylor (= Syncesia myrticola (Fée) Tehler).

Taxonomic Literature: Tehler A., Cryptog. Bot. 3: 139-151 (1993), Tehler A., Flora
Neotropica 74: 1-48 (1997); Tehler A. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 478, Tempe (2002).

Biogeography: Checklist records: Guianas, Sonoran Desert, and Thailand.

Ecology: Biotroph; lichenized; corticolous; substrate rarely non-calciferous.

Lichen Photobionts: Primary photobiont present; trentepohlioid. Primary photobiont taxonomy: Trentepohlia; Trentepohliaceae; Trentepohliales, Ulvophyceae, Eukariota. Secondary photobiont absent.

Thallus: Indistinct or crustose, not subdivided parts, leprose or granular. Thallus Outline: Soon disappearing or persistent. Upper Surface: White or brownish yellow; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, forming all across the thallus surface, becoming adnate or soon sessile, stromatic. Exciple: Black or brown. Periphyses: Absent. Epithecium: Apical cells brown, hyaline, or brownish yellow. Interascal Hyphae: Present, scarcely branched or distinctly branched, not or scarcely anastomosed or distinctly anastomosed. Hypothecium: Black or brown.

Asci: Tholus thickened, amyloid, with amyloid tube; dehiscence bitunicate; exoascus not amyloid, not hemiamyloid or hemiamyloid.

Ascospores: c. 8 per ascus, curved (sometimes nearly straight) or fusiform, 22-59 µm long, 3-6 µm wide; septa present; transversally septate, 3-transversally septate, formed by the proper spore wall; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; immersed, adnate, or sessile, formed all accross the thallus surface.

Conidia: Filiform or curved; cell wall hyaline.

Secondary Metabolites: Present, of the following substance class(es): orcinol depsides, ß-orcinol depsides, ß-orcinol depsidones, (higher) aliphatic acids, or dibenzofurans [and usnic acids].

(report generated 04.Okt.2007)


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