Phaeotrema Müll. Arg. (1887)

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Sipman H. (98-01-15); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Phaeotrema. Thelotremataceae (Nyl.) Stizenb. (1862); Ostropales.

Type Information: Type: Phaeotrema subfarinosum (Fée) Müll. Arg.

Taxonomic Literature: Müller J., Mem. Soc. Phys. Genève 29: 3-80 (1887).

Ecology: Biotroph; lichenized; corticolous.

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

Thallus: Crustose, not subdivided parts. Upper Surface: White; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

Medulla: Iodine reaction in Lugol's solution negative; not different with or without KOH pre-treatment (euamyloid).

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, not emerging, becoming adnate. Margin: Indistinct to distinct; external filaments absent. Exciple: Black or brown. Periphyses: Absent. Epithecium: Apical cells hyaline. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Asci: Tholus thickened, not amyloid; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, fusiform or oblong-obtuse, 20-22 µm long, 11-12 µm wide, obtuse; septa present; transversally septate, 3-transversally septate, formed by the endospore wall layer; wall thin, not thickened at the septum, pale brown or dark brown, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present.

Secondary Metabolites: Not detected or present, of the following substance class(es): ß-orcinol depsidones.

(report generated 04.Okt.2007)