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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: 2. Siphulastrum. Genus of unknown placement (incertae sedis); family of unknown placement (incertae sedis); Lecanorales.

Taxonomic Literature: Galloway D.J., Flora of New Zealand lichens: i-lxxiii, 1-662 [526-527], Wellington (1985); Poelt J., Bestimmungsschlüssel Europäischer Flechten: 1-757 [609] (1969).

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

Thallus: Crustose, not subdivided parts, squamulose or subfruticose. Upper Surface: Black, brown, grey, brownish yellow, or yellow; special structures absent. Lower Surface: Attached by the whole lower surface or attached by holdfasts; special structures absent.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, forming directly at the thallus margin, not emerging, becoming adnate to soon sessile. Margin: Indistinct to prominent; external filaments absent. Periphyses: Absent. Interascal Hyphae: Present.

Ascospores: c. 8 per ascus, ellipsoid, 11-14 µm long, 5-9 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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