Muellerella Hepp (1862)

Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Scholz P. (06-06-12, 06-08-07) and Triebel D. (99-02-12; 01-08-12); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 13. Muellerella. Synonyms: Thelidiola C. W. Dodge (1968); Verrucariaceae Zenker (1827); Verrucariales.

Type Information: Type: Muellerella polyspora Hepp ex Müll. Arg.

Taxonomic Literature: Alstrup V., Folia Cryptog. Estonica 39: 1-2 (2002); Diederich P., Lejeunia 119: 1-26 [10-12] (1986); Döbbeler P.
& Triebel D., Bot. Jahrb. Syst. 107(1-4): 503-519 (1985);
Hawksworth D.L., Bull. Brit. Mus. (Nat. Hist.), Bot. 14(2): 43-181
[173] (1985); Hawksworth D.L., Lichenologist 35(3): 191-232 (2003);
Kocourková J., Acta Mus. Nat. Pragae, Ser. B., Hist. Nat. 55
(3-4): 59-169 [102-106] (2000); Matzer M., Nova Hedwigia 56: 203-210
(1993); Renobales G., Guineana 2: 1-310 [130-131] (1996); Triebel D.,
Biblioth. Lichenol. 35: 1-278 [150-176] (1989); Triebel D., Sendtnera
1: 273-280 [273-274] (1993).

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

Ecology: Saprobic or biotroph; lichenicolous; terricolous, bryophytic, lignicolous, or corticolous; substrate non-calciferous or 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, becoming adnate to soon sessile. Margin: External filaments absent. Exciple: Black or brown. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, hemiamyloid. Interascal Hyphae: Absent. Hypothecium: Black, brownish yellow, or brown.

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

Ascospores: 16-32 to more than 32 per ascus, globose, ellipsoid, broadly ellipsoid, ovoid, oblong-obtuse, oblong, or cylindrical, 2.5-15.5 µm long, 1.5-7 µm wide, obtuse or aciculate; septa absent or present; transversally septate, 1-3-transversally septate; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, pale brown or dark brown, in Lugol's Solution negative, wall not ornamented or ornamented.

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

Conidiogeneous Cells: Apical. Conidia: Bacilliform.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)