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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. (98-01-01; 00-07-05); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 7. Merismatium. Verrucariaceae Zenker (1827); Verrucariales.

Type Information: Type: Merismatium lopadii (Arnold) Zopf (= Merismatium nigritellum (Nyl.) Vouaux).

Taxonomic Literature: Alstrup V., Graphis Scripta 8: 25-29 [27-28] (1997); Alstrup V. &
Hansen E.S., Graphis Scripta 12: 41-50 (2001); Hafellner J. &
Obermayer W., Cryptog. Bryol. Lichénol. 16(3): 177-190 (1995);
Hansen E.S., Graphis Scripta 9: 7-9 (1998); Hawksworth D.L., Trans.
Brit. Mycol. Soc. 74: 363-386 (1980) - sub Leptosphaerulina
peltigerae; Kümmerling H., Triebel D. & Rambold G.,
Biblioth. Lichenol. 53: 147-160 (1993); Martínez Moreno M.I.,
Ruzia 15: 1-200 [169](1999) - sub Leptosphaerulina; Renobales G.,
Guineana 2: 1- 310 [129-130, 255] (1996); Roux C., Gueidan C. &
Navarro-Rosinés P., Mycotaxon 84: 1-20 (2002); Santesson R.,
The lichens and lichenicolous fungi of Sweden and Norway, Lund: 1-240
[129] (1993) - sub Leptosphaerulina; [136-137] - sub Merismatium;
Triebel D., Biblioth. Lichenol. 35: 1-278 [177-194] (1989); Triebel
D., Sendtnera 1: 273-274 (1993).

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

Ecology: Saprobic or biotroph; algicolous or lichenicolous; terricolous, bryophytic, lignicolous, or corticolous; substrate calciferous.

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, olive, or brown. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, hemiamyloid. Interascal Hyphae: Absent. Hypothecium: Brownish yellow or brown.

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

Ascospores: c. 8 per ascus, globose, ellipsoid, or ovoid, 8.5-32 µm long, 3.5-15 µm wide, obtuse or aciculate; septa present; transversally septate or both transversally and longitudinally, 3-9-transversally septate; wall thin, not thickened at the septum, laterally constricted where the septum meets the spore wall, hyaline (according to Martinez-Moreno (1999)), pale brown, or dark brown, in Lugol's Solution negative, wall not ornamented or ornamented.

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