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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: 5. Petractis. Stictidaceae Fr. (1849); Ostropales.

Taxonomic Literature: Coppins B.J. & Gilbert O.L. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Vezda A., Preslia 37: 127-143 (1965).

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

Lichen Photobionts: Primary photobiont present; trentepohlioid and cyanobacterial. Primary photobiont taxonomy: Scytonema and Trentepohlia (A. Beck 22-05-97); Scytonemataceae and Trentepohliaceae; Nostocales and Trentepohliales, Cyanobacteria, Prokaryota. Secondary photobiont absent.

Thallus: Indistinct or crustose, not subdivided parts. Upper Surface: Brownish yellow or white; special structures absent. 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 or perithecioid, orbicular, forming all across the thallus surface, not emerging. Margin: Indistinct to distinct; external filaments absent. Exciple: White or brownish yellow. Periphyses: Absent. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed.

Ascospores: c. 8 per ascus, fusiform, 14-38 µm long, 4-18 µm wide; septa present; transversally septate or both transversally and longitudinally, 3-transversally septate; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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

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