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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Jørgensen P. M. (98-03-20); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 2. Vestergrenopsis. Genus of unknown placement (incertae sedis); Peltigerineae; Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [815-816] (1985); Henssen A., Can. J. Bot. 41: 1259-1306 (1967); James P.W. & Jørgensen P.M. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992).

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

Lichen Photobionts: Primary photobiont present; cyanobacterial. Primary photobiont taxonomy: Scytonemataceae; Nostocales. Secondary photobiont absent.

Thallus: Crustose, not subdivided parts, placodioid. Upper Surface: Brown or olive; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate or isidiate; not sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface; special structures absent.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, soon sessile. Margin: Distinct to prominent; external filaments absent. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells brown. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

Ascospores: c. 8 to 12-16 per ascus, ellipsoid, broadly ellipsoid, or globose, 7-10 µm long, 4-6 µm wide, obtuse; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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