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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: 5. Leioderma. Genus of unknown placement (incertae sedis); Peltigerineae; Lecanorales.

Taxonomic Literature: Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [243-244], Wellington (1985); Galloway D.J. & Jørgensen P.M., Lichenologist 19: 345-400 (1987); Jørgensen P.M., J. Jpn. Bot. 69: 383-386 (1994); Jørgensen P.M., J. Hattori Bot. Lab. 76: 197-206 (1994); Jørgensen P.M. & Galloway D.J., Lichenologist 21: 295-301 (1989).

Biogeography: Checklist records: New Zealand, United States and Canada (continental), and Guianas.

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

Thallus: Foliose, not subdivided parts, granular or rimose, lobed. Thallus Outline: Soon disappearing. Upper Surface: Brown, grey, or brownish yellow; special structures absent or present:; not pseudocyphellate; eciliate; without hairs or hairy; not isidate; not sorediate or sorediate; not cephalodiate; not lobulate or lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by holdfasts; special structures present:; not pseudocyphellate; not cyphellate; rhizinate; without thalloconidia thalloconidia; not cavernulate; tomentose.

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 to substipitate. Margin: Distinct to prominent; external filaments absent. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells brown. Hymenium: Iodine reaction: Lugol’s negative. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Brown or brownish yellow.

Ascospores: c. 8 per ascus, ellipsoid, 6-23 µm long, 6-12 µm wide, obtuse; septa absent; wall thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented or ornamented.

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

Secondary Metabolites: Not detected or present, of the following substance class(es): (tri-)terpenoids.

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