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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Guderley R. (95-07-0) and Lumbsch H. T. (95-07-01, 98-03-17); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 1. Ingvariella. Thelotremataceae (Nyl.) Stizenb. (1862); Ostropales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest, N.S. 7: 1-893 [354-356] (1985) - sub Diploschistes; Guderley R., Lumbsch H.T. & Feige G.B., Nova Hedwigia 64: 147-154 (1997); Lumbsch H.T., J. Hattori Bot. Lab. 66: 133-196 (1989) - sub Diploschistes.

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

Thallus: Crustose, rimose. Upper Surface: Brownish yellow; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

Medulla: Iodine reaction in Lugol's solution positive; 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: Apothecioid, orbicular, forming all across the thallus surface, becoming adnate. Margin: Distinct to prominent; external filaments absent. Exciple: Black or brown. Periphyses: Absent. Epithecium: Apical cells black or brown. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

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

Ascospores: 1–2 to c. 4 per ascus, broadly ellipsoid, 28-42 µm long, 14-23 µm wide, obtuse; septa present; both transversally and longitudinally; wall thin, not thickened at the septum, hyaline or dark brown, in Lugol's Solution negative, wall not ornamented.

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

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