Anisomeridium (Müll. Arg.) M. Choisy (1928)

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Aptroot A. (00-02-02), Triebel D. (00-02-02), and Scholz P. (02-05-13); not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: genus. Number of known taxa within this rank: 100 (estimation provided by A. Aptroot 99-09-27). Anisomeridium. Synonyms: Ascocratera Kohlm.; Ditremis Clem.; Monoblastiaceae W. Watson (1929); Pyrenulales.

Type Information: Type: Arthopyrenia xylogena Müll. Arg.

Taxonomic Literature: Aptroot A. in: Nash T.H. III et al. (eds), Lichen Flora of the Greater Sonoran Desert Region vol. 1: 99-101, Tempe (2002); Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M., Biblioth. Lichenol. 64: 1-220 [13-17] (1997); Coppins B.J. & James P.W. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992) - sub Anisomeridium; Galloway D.J., Flora of New Zealand Lichens: i lxxiii, 1-662 [5-6], Wellington (1985) - sub Anisomeridium; Harris R.C., Michigan Bot. 12: 3-68 (1973) - sub Anisomeridium; Harris R.C., More Florida lichens including the 10c tour of the pyrenolichens: 1-192 [123-131, 133-151], Bronx NY (1995) - sub Anisomeridium.

Biogeography: Checklist records: Austria, Germany, Guianas, Italy, New Guinea, New Zealand, Sonoran Desert, Sweden and Norway, and United States and Canada (continental).

Ecology: Biotroph; lichenized; bryophytic, lignicolous, corticolous, or epiphyllous; substrate non-calciferous or calciferous.

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

Thallus: Indistinct or crustose, not subdivided parts. Thallus Outline: Soon disappearing or persistent. Upper Surface: Grey, greyish green, or white; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

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, not emerging, becoming adnate or soon sessile. Wall: Not carbonized, not fused. Margin: Indistinct; external filaments absent. Exciple: Black or brown. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent or present, scarcely branched or distinctly branched, distinctly anastomosed. Hypothecium: White or brownish yellow.

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

Ascospores: 1–2, c. 4, or c. 8 per ascus, broadly ellipsoid, ellipsoid, ovoid, clavate, or fusiform, 9-22.5 µm long, 3-6.5 µm wide, obtuse; septa present; transversally septate, 1-3-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, middle brown or hyaline, in Lugol's Solution negative, wall not ornamented or ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial (sometimes with long necks); immersed or sessile, formed all accross the thallus surface.

Conidia: Globose, ellipsoid, or bacilliform; microconidial or macroconidial; aseptate; up to 0-septate.

Secondary Metabolites: Not detected or present, of the following substance class(es): xanthones.

(report generated 04.Okt.2007)