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

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 6. Dichosporidium. Opegraphaceae Stizenb. (1862); Arthoniales.

Type Information: Type: Dichosporidium glomeratum Pat. (= Dichosporidium nigrocinctum (Ehrenb.: Fr.) G. Thor).

Taxonomic Literature: Eriksson O.E. & Hawksworth D.L., Syst. Ascomycetum 6: 111-165 [124] (1987); Hawksworth D.L., Bull. Brit. Mus. Nat. Hist. (Bot.) 9: 1-98 [73] (1981) - sub Dichosporium glomeratum; Henssen A. & Thor G., Nato ASI Series, series A: Life Sciences 269: 43-56 [44] (1994); Henssen A. & Thor G., Nord. J. Bot. 18: 95-120 (1998); Patouillard N., Bull. Soc. Mycol. Françe 15: 191-209 [207-208 + pl. IX, fig. 2] (1899); Thor G., Opera Bot. 103: 1-92 [63-75] (1990); Vouaux L., Bull. Soc. Mycol. Françe 28: 177-256 [198-199] (1912).

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

Thallus: Crustose, not subdivided parts, filamentose, leprose, squamulose, or granular. Thallus Outline: Soon disappearing or persistent. Upper Surface: Green, grey, brownish yellow, or white; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate or isidiate; not sorediate or sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface; special structures absent or present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

Medulla: Iodine reaction 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, stromatic. Margin: External filaments absent. Exciple: Black or brown. Periphyses: Absent. Epithecium: Apical cells hyaline. Hymenium: Iodine reaction: hemiamyloid. Interascal Hyphae: Present, distinctly branched, not or scarcely anastomosed. Hypothecium: Black, brown, or brownish yellow.

Ascospores: c. 8 per ascus, clavate, curved, or semilunate, 33-83 µm long, 2-5 µm wide; septa present; transversally septate, 4-10-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; immersed or sessile, formed all accross the thallus surface.

Secondary Metabolites: Not detected or present, of the following substance class(es): ß-orcinol depsidones.

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