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Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Scholz P. (06-06-13; 06-08-07; 07-07-24) and Triebel D. (99-02-12; 00-03-07; 00-06-12; 01-08-10); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 27. Stigmidium. Synonyms: Pharcidia Körber; genus of unknown placement (incertae sedis); Dothideales.

Taxonomic Literature: Taxonomic notes: vegetative hyphae of some taxa brown. Alstrup V., Graphis Scripta 5: 96-104 (1993); Alstrup V. & Olech M., Fragm. Flor. Geobot. 41: 747-752 (1996); Calatayud V. & Triebel D., Nova Hedwigia 69(3-4): 439-448 (1999); Calatayud V. & Triebel D., Biblioth. Lichenol. 78: 27-33 (2001); Calatayud V. & Triebel D., Lichenologist 35(2): 103-116 (2003); Cole M.S. & Hawksworth D. L., Mycotaxon 77: 305-338 [330-332] (2001); Etayo J., Candollea 49: 245-249 (1994); Etayo J., Bull. Soc. Linn. Provençe 51: 153-162 [159-160] (2000); Etayo J. & Osorio H. S., Com. Bot. Mus. Nac. Hist. Nat. Antropol. 6(129): 1-19 [12-17] (2004); Hafellner J., Herzogia 10: 1-28 [23-24] (1994); Hafellner J., Bull. Soc. Linn. Provençe 45: 219-234 [230-232] (1994); Hafellner J. &
Obermayer W., Cryptog. Bryol. Lichénol. 16: 177-190 (1995); Hafellner J., Triebel D., Ryan B.D. & Nash T.H., Mycotaxon 84: 293-329 (2002); Ihlen P.G., Lichenologist 30: 27 57 [53-54] (1998); Keissler K. von, Rabenh. Kryptog.-Fl. 8: 1-712 [365-366] (1930) - sub Pharcidia arthoniae; Kocourková J., Acta Mus. Nat. Pragae, Ser. B., Hist. Nat. 55(3-4): 59-169 [124-127] (2000); Lücking R., Cryptog. Mycol. 27: 121-147 [131-132] (2006); Martínez Moreno M.I., Ruzia 15: 1-200 [176-177] (1999); Matzer M., Mycol. Pap. 171: 1- 202 [155-169] (1996); Matzer M. & Hafellner J., Biblioth. Lichenol. 37: 1-138 [115-120](1990); Molitor F. & Diederich P., Bull. Soc. Naturalistes Luxemb. 98: 69-92 [78-80] (1997); Roux C., Navarro Rosinés P. & Tranchida F.,
Cryptogamie, Bryol. Lichénol. 19(2-3): 221-228 (1998); Roux C. & Navarro Rosinés P., Bull. Soc. Linn. Provençe 45: 443-450 (1994); Renobales G., Guineana 2: 1-310 [172, 263] (1996); Roux C. & Triebel D., Bull. Soc. Linn. Provençe 45: 451-542 (1994); Roux C., Triebel D., Bricaud O. & Le Coeur D., Canad. J. Bot. 73: 622-672 (1995); Triebel D.,
Biblioth. Lichenol. 35: 1-278 [79-86] (1989).

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

Ecology: Saprobic or biotroph; lichenized (only 1 species, S. concentricum) or lichenicolous; terricolous, bryophytic, corticolous, or epiphyllous; substrate non-calciferous or calciferous.

Lichen Photobionts: Primary photobiont absent or present; chlorococcal. Primary photobiont taxonomy: Phycopeltis; Trentepohliaceae; Trentepohliales, Chlorophyceae, Eukariota. Secondary photobiont 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, not emerging, becoming adnate to soon sessile. Wall: Not fused. Margin: External filaments absent or present. Exciple: Black, olive, brownish yellow, or brown. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent or present, scarcely branched, not or scarcely anastomosed. Hypothecium: White, olive, brownish yellow, or brown.

Asci: Tholus thickened, not amyloid; ocular chamber indistinct; dehiscence bitunicate; exoascus not amyloid or euamyloid, not hemiamyloid.

Ascospores: c. 4 to c. 8 per ascus, ellipsoid, ovoid, oblong-obtuse, or fusiform, (5.5)-7-23 µm long, 2-7.5 µm wide, obtuse or aciculate; septa present; transversally septate, 1-3-transversally septate, formed by the proper spore wall; wall thin or thick, distinctly differentiated into primary and secondary wall, 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, pale brown, or dark brown, in Lugol's Solution negative, wall not ornamented or ornamented.

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