Homostegia Fuckel (1870)

Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Triebel D. (98-01-01; 01-08-12; 02-04-05); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 1. Homostegia. Genus of unknown placement (incertae sedis); Dothideales.

Type Information: Type: Homostegia adusta Fuckel (= Homostegia piggotii (Berk. & Broome)


P. Karst.).

Taxonomic Literature: Taxonomic notes: Homostegia parmeliana (Jacz.) Vouaux is excluded and accepted as type
species of the monotypic genus Trematosphaeriopsis Elenkin (see
Hafellner 2001). Alstrup V.& Cole M.S., Bryologist 101(2): 221-229 (1998); Cole

M.S. & Hawksworth D.L., Mycotaxon 77: 305-338 [314-316] (2001);

Hawksworth D.L., Bull. Brit. Mus. (Nat. Hist.), Bot. 9(1): 1-98
[73]
(1981); Hawksworth D.L., Lichenologist 15: 1-44 [7, 38]
(1983); Hafellner J., Mycotaxon 80: 381-387 (2001); Keissler K. von,
Rabenh. Kryptog.-Fl. 8: 1-712 [298-304] (1930) - incl. Telimena
encaustica; Santesson R., Svensk Bot. Tidskr. 54: 501-522 [503]
(1960); Vouaux L., Bull. Trimestriel Soc. Mycol. France 28: 177-256
[196-198] (1912) - excluding H. encaustica.

Biogeography: Checklist records: Austria, Germany, Great Britain, and United States and Canada (continental).

Ecology: Biotroph; lichenicolous; substrate non-calciferous.

Lichen Photobionts: Primary photobiont absent. Secondary photobiont absent.

Thallus: Indistinct.

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, not emerging, stromatic (stromata pluriloculate). Margin: External filaments absent. Exciple: Black or brown. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative or Lugol’s positive, not hemiamyloid. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: Black or brown.

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

Ascospores: c. 8 per ascus, ellipsoid, fusiform, oblong-obtuse, ovoid, or curved, 18-36.5 µm long, 6-12 µm wide, obtuse or aciculate; septa present; transversally septate or both transversally and longitudinally, 3-transversally septate; wall thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, dark brown to sub-hyaline to pale brown, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed to present; pycnidial; immersed.

Conidiogeneous Cells: Apical. Conidia: Globose.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)