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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Aptroot A. (95-02-10); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: genus. Number of known taxa within this rank: 19. Polymeridium. Trypetheliaceae Zenker (1927); Pyrenulales.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M., Biblioth. Lichenol. 64: 1-220 [142-143] (1997); Harris R.C., Boletim do Museu Paraense "Emilio Goeldi", série Botánica 7(2): 619-644 (1991); Harris R.C., Bot. Mus. Para. Emílio Goeldi, sér. Bot. 7: 619-699 (1993); Tucker S.C. & Harris R.C., Bryologist 82: 1-20 (1980);.

Biogeography: Checklist records: United States and Canada (continental), Guianas, Thailand, and New Guinea.

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

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Orbicular, not emerging. Wall: Not fused. Margin: Indistinct; external filaments absent. Exciple: Black. Periphyses: Absent. Interascal Hyphae: Present?, distinctly branched, distinctly anastomosed. Hypothecium: Black.

Asci: Tholus thickened, not amyloid; ocular chamber broad; dehiscence bitunicate.

Ascospores: c. 4 or c. 8 per ascus, ellipsoid, 13-55 µm long, 4-20 µm wide, obtuse or aciculate; septa present; transversally septate or both transversally and longitudinally, 1-15-transversally septate, formed by the endospore wall layer; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Secondary Metabolites: Not detected or present, of the following substance class(es): xanthones.

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