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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Aptroot A. (95-02-18) and Sipman H. (98-01-15); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 4. Gyrostomum. Graphidaceae Dumort. (1822); Ostropales.

Type Information: Type: Gyrostomum scyphuliferum (Ach.) Nyl. (= Lecidea scyphuliferum Ach.).

Biogeography: Checklist records: Guianas, Thailand, United States and Canada (continental), and Republic of South Africa.

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

Thallus: Indistinct or crustose, not subdivided parts. Upper Surface: Brownish yellow; special structures absent. Lower Surface: Attached by the whole lower surface.

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: Black. Periphyses: Absent. Epithecium: Apical cells black. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Black.

Ascospores: c. 8 per ascus, ellipsoid, 33-48 µm long, 13-16 µm wide, obtuse; septa present; both transversally and longitudinally, 8-10-transversally septate, formed by the endospore wall layer; 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.

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