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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: 1. Xyloschistes. Genus of unknown placement (incertae sedis); Ostropales.

Taxonomic Literature: Poelt J., Bestimmungsschlüssel Europäischer Flechten: 1-757 [700] (1969); Zahlbruckner A., in Engler A. & Prantl K., Nat. Pflanzenfam. 1, Abt. 1 asterisk: 1-249 [94] (1903).

Lichen Photobionts: Primary photobiont present; chlorococcal. Secondary photobiont 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, not emerging, becoming adnate to soon sessile. Margin: External filaments absent. Exciple: Black or brown. Periphyses: Absent. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Brown.

Ascospores: 1–2 per ascus, 20-30 µm long, 6-8 µm wide, obtuse; septa present; transversally septate or both transversally and longitudinally, 6-11-transversally septate; wall thin, not thickened at the septum, dark brown, in Lugol's Solution negative, wall not ornamented.

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