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Polydesmia Boud. (1885)

Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Triebel D. (98-01-01); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 4. Polydesmia. Hyaloscyphaceae Nannf. (1932); Leotiales.

Type Information: Type: Polydesmia pruinosa (Jerdon) Boud.

Taxonomic Literature: Huhtinen S. & Santesson R., Lichenologist 29: 205-208 (1997); Korf R.P., Mycotaxon 7: 457-492 [470-482] (1978); Raitviir A. & Galán R., Mycotaxon 53: 447-454 (1995).

Biogeography: Checklist records: Germany, Great Britain, and Sweden and Norway.

Ecology: Biotroph or saprobic; fungicolous, lichenicolous, or phytopathogenic; terricolous or epiphyllous.

Lichen Photobionts: Primary photobiont absent. Secondary photobiont absent.

Thallus: Indistinct.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, soon sessile to substipitate. Margin: Prominent; external filaments present. Exciple: White. Periphyses: Absent. Epithecium: Apical cells grey, hyaline, or brownish yellow. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Asci: Tholus thickened, amyloid, with amyloid tube; ocular chamber indistinct; dehiscence unitunicate; exoascus euamyloid, not hemiamyloid.

Ascospores: c. 4 to c. 8 per ascus, ellipsoid, allantoid, curved, or fusiform, 6-24 µm long, 1.5-5.5 µm wide, obtuse or aciculate; septa present; transversally septate, 1-3-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.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)

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