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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Lücking R. (95-08-01); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: genus. Number of known taxa within this rank: 5 (A. Aptroot 99-09-27). Phyllobathelium. Phyllobatheliaceae G. Bitter & F. Schilling (1927); Pyrenulales.

Taxonomic Literature: Aptroot A. & Sipman H.J.M., Lichenologist 25: 121-135 (1993); Lücking R., Lichenologist 31(3): 269-289 (1999); Lücking P., Aptroot A. & Thor G., Lichenologist 29: 221-228 (1997; Santesson R., Symb. Bot. Upsal. 12: 1-590 [287-292] (1952); Santesson R. & Tibell L., Austrobaileya 2: 529-545 (1988).

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

Thallus: Crustose, not subdivided parts, granular. Thallus Outline: Soon disappearing or persistent. Upper Surface: Green or grey; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent or present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

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, stromatic. Wall: Not carbonized, not fused. Margin: Prominent; external filaments absent. Exciple: Black, brown, white, or brownish yellow. Periphyses: Absent. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed.

Asci: Tholus thickened, amyloid, with amyloid cap; ocular chamber broad; dehiscence bitunicate.

Ascospores: 1–2 to c. 8 per ascus, oblong, cylindrical, oblong-obtuse, or ovoid, 30-200 µm long, 12-36 µm wide, obtuse; septa present; both transversally and longitudinally, formed by the proper spore wall; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; stipitate, formed all accross the thallus surface.

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