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Data Set Maintenance: Data set standard item; reviewer(s): Sipman H. (98-01-15); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 1. Polistroma. Thelotremataceae (Nyl.) Stizenb. (1862); Ostropales.

Taxonomic Literature: Rojas Clemente S. de, Ensayo Varied. Vid Comun: 299-§§§§§§ (1807).

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

Thallus: Crustose, not subdivided parts. Upper Surface: Green or brownish yellow; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

Medulla: Iodine reaction in Lugol's solution negative; not different with or without KOH pre-treatment (euamyloid).

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, not emerging. Margin: Indistinct to distinct; external filaments absent. Exciple: Black. Periphyses: Absent. Epithecium: Apical cells hyaline or brownish yellow. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Ascospores: c. 8 per ascus, ellipsoid, 1 µm long, 1 µm wide, obtuse; septa present; transversally septate, formed by the proper spore wall; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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