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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 6. Santessoniella. Genus of unknown placement (incertae sedis); Peltigerineae; Lecanorales.

Taxonomic Literature: Henssen A. in: Tibell L. & Hedberg I. (eds), Symb. Bot. Upsal. 32: 75-93 (1997).

Ecology: Biotroph; lichenized; terricolous, bryophytic, lignicolous, or corticolous; substrate non-calciferous.

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

Thallus: Crustose, leprose, granular, squamulose, or subfruticose. Thallus Outline: Soon disappearing or persistent. Upper Surface: Brown, grey, or olive; special structures absent. Lower Surface: Attached by the whole lower surface or attached by holdfasts; special structures absent or present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose or 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. Margin: Indistinct to prominent. Epithecium: Apical cells brown. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed.

Ascospores: c. 8 per ascus, ellipsoid, 11-23-(25) µm long, 5.5-12 µm wide, obtuse; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented or ornamented.

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

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