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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, 95-02-18); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 20. Massaria. Massariaceae Nitschke (1869); Pyrenulales.

Taxonomic Literature: Barr M.E., Mycotaxon 9: 17-37 (1979); Shoemaker R.A. & Leclair P.M., Can. J. Bot. 53: 1568-1598 (1975).

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

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, not emerging. Margin: Indistinct; external filaments absent. Exciple: Black. Periphyses: Absent. Epithecium: Apical cells black. Interascal Hyphae: Present?, scarcely branched, distinctly anastomosed. Hypothecium: Black.

Ascospores: c. 8 per ascus, ellipsoid, 1 µm long, 1 µm wide, obtuse; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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