Requienella Fabre (1883)

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Aptroot A. (95-02-10); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 2. Requienella. Synonyms: Acrocordiella O.E. Erikss.; Requienellaceae Boise (1986); Pyrenulales.

Type Information: Type: Requienella seminuda (Pers.: Fr.) Boise.

Taxonomic Literature: Aptroot A., Biblioth. Lichenol. 44: 1-178 (1991).

Biogeography: Checklist records: United States and Canada (continental).

Ecology: Biotroph or saprobic; lichenized; corticolous.

Lichen Photobionts: Primary photobiont absent or present; trentepohlioid. Secondary photobiont absent.

Thallus: Indistinct.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, forming all across the thallus surface, becoming adnate, stromatic. Wall: Carbonized around the ostiole, lacking a clypeus, not fused. Margin: External filaments absent. Exciple: Black or brown. Periphyses: Absent. Hymenium: Oil inspersed. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed.

Asci: Tholus thickened, not amyloid; ocular chamber indistinct; dehiscence bitunicate.

Ascospores: c. 8 per ascus, oblong or fusiform, 15-43 µm long, 7-17 µm wide, obtuse or aciculate; septa present; transversally septate or both transversally and longitudinally, 3-13-transversally septate, formed by the endospore wall layer; wall thin, not thickened at the septum, dark brown, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)