Trichonectria Kirschst. (1907)

Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Scholz P. (06-06-13; 06-08-07) and Triebel D. (98-01-01; 00-03-04; 01-08-07); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 7. Trichonectria. Bionectriaceae Samuels & Rossman (1999); Hypocreales.

Type Information: Type: Trichonectria aculeata Kirschst. (= Trichonectria hirta (Bloxam) Petch).

Taxonomic Literature: Taxonomic notes: Nectria rubefaciens was transfered to Trichonectria rubefaciens (Ellis & Everh.) Diederich & Schroers in Serusiaux et al. (1999) Anamorph: Acremonium. After that it was recombined to Nectriopsis rubefaciens by Cole & Hawksworth (2001). It should be rechecked whether species with 1-septate, small and ornamented ascospores really belong to Trichonectria. Döbbeler P., Mitt. Bot. Staatssamml. München 14: 1-360 [118-
123] (1978); Etayo J., Nova Hedwigia 67(3-4): 499-509 (1998); Etayo
J., Anales J. Bot. Madrid 58(2): 219-222 (2001); Etayo J. & Boom
P.P.G. van den, Nova Hedwigia 81: 157-162 (2005); Hawksworth D.L.,
Notes Roy. Bot. Gard. Edinburgh 36: 181-197 (1978); Rossman A.Y.,
Mycol. Pap. 150: 1-164 [77-79 + fig. 46] (1983); Rossman A.Y.,
Samuels G.J., Rogerson C.T. & Lowen R., Genera of the
Hypocreales: 1-7 (1993) - [unpublished manuscript presented at the
First International Workshop on Ascomycete Systematics, Paris];
Samuels G.J., Mem. New York Bot. Gard. 48: 1-77 [11-15] (1988);
Serusiaux E., Diederich P., Brand A. M. & Boom P. van den,
Lejeunia 162: 1-95 [56-57] (1999); Sérusiaux E., Diederich P.,
Ertz D. & Boom P. van den, Lejeunia N.S. 173: 1-48 (2003);
Triebel D., Biblioth. Lichenol. 35: 1-278 [237] (1989).

Biogeography: Checklist records: Great Britain.

Ecology: Saprobic or biotroph; lichenicolous or fungicolous; bryophytic, lignicolous, corticolous, or epiphyllous.

Lichen Photobionts: Primary photobiont absent. Secondary photobiont absent.

Thallus: Indistinct, not subdivided parts, filamentose. 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: Perithecioid, orbicular, forming all across the thallus surface, soon sessile, stromatic. Margin: External filaments present (thick walled ascomata hairs). Exciple: White, yellow, brownish yellow, or orange. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent or present, distinctly branched, distinctly anastomosed. Hypothecium: White, yellow, or brownish yellow.

Asci: Tholus not thickened or thickened, not amyloid; dehiscence unitunicate; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid, oblong, cylindrical, fusiform, filiform, or curved, 8-120 µm long, (2)-3-18 µm wide, obtuse or aciculate; septa present; transversally septate, 1-25-transversally septate, formed by the proper spore wall; wall thin, not thickened at the septum, not constricted where the septum meets the spore wall or laterally constricted where the septum meets the spore wall, hyaline or pale brown, in Lugol's Solution negative, wall not ornamented or ornamented.

Conidiomata: Absent resp. not observed or present; hyphomycetous.

Conidiogeneous Cells: Apical. Conidia: Bacilliform.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)