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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: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 10 (A. Aptroot 99-09-27). Monoblastia. Monoblastiaceae W. Watson (1929); Pyrenulales.

Taxonomic Literature: Aptroot A., Bryologist 94: 404-406 (1991); Harris R.C., Some Florida Lichens: 36 (1990); Riddle L.W., Mycologia 15: 68-88 (1923).

Biogeography: Checklist records: United States and Canada (continental) and Guianas.

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

Thallus: Crustose, not subdivided parts, granular or rimose. Upper Surface: Grey 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: Perithecioid, orbicular, forming all across the thallus surface, not emerging, becoming adnate. Wall: Not carbonized, not fused. Margin: Indistinct or prominent; external filaments absent. Exciple: Black, brown, or white. Periphyses: Absent. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: Black, brown, white, or brownish yellow.

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

Ascospores: c. 4 to c. 8 per ascus, ellipsoid, broadly ellipsoid, oblong, globose, or oblong-obtuse, 9-50 µm long, 7-20 µm wide, obtuse; septa absent; wall not thickened at the septum, hyaline, in Lugol's Solution negative, wall ornamented.

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