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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Lumbsch H. T. (98-03-19); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 4. Saccomorpha. Agyriaceae Corda (1838); Agyriineae; Lecanorales.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M., Biblioth. Lichenol. 64: 1-220 [137-138] (1997) - sub Placynthiella; Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [697-698] (1985); Coppins B.J. & James P.W., Lichenologist 16: 241-247 (1984); Hafellner H., Beih. Nova Hedwigia 79: 241-371 [334-335] (1984); Lumbsch H.T., J. Hattori Bot. Lab. 83: 1-73 (1997); Lumbsch H.T., Kashiwadani H. & Streimann H., Pl. Syst. Evol. 185: 285-292 (1993) - sub Placynthiella; Purvis O.W. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992) - sub Placynthiella.

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

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Chlorella (A. Beck 22-05-97); genus incertae sedis; family of unknown placement (incertae sedis), order of unknown placement. Secondary photobiont absent.

Thallus: Crustose, granular. Upper Surface: Brown, green, or brownish yellow; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate; not cephalodiate; not lobulate; without granules or with 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, forming all across the thallus surface, soon sessile. Margin: Indistinct to prominent; external filaments absent. Exciple: Brown. Periphyses: Absent. Epithecium: Apical cells brown. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, distinctly branched, not or scarcely anastomosed. Hypothecium: Brown.

Asci: Tholus thickened, not amyloid or amyloid, with amyloid cap or tube and flanks; dehiscence lecanoralean; exoascus euamyloid, hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid, 8-16.5 µm long, 4-7 µm wide, obtuse; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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

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