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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Aptroot A. (95-02-18, 00-2-10), Triebel D. (00-2-00), and Scholz P. (02-05-15); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 4-15 (estimated). Julella. Xanthopyreniaceae Zahlbr. (1926); Pyrenulales.

Taxonomic Literature: Aptroot A. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 254-256, Tempe (2002); Aptroot A. & v.d. Boom P.P.G., Mycotaxon 56: 1-8 (1995); Barr M.E., Sydowia 38: 11-19 (1986) ["1985"]; Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [623-624] (1985) - sub Polyblastiopsis; Coppins B.J. & James P.W. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Dodge C.W., Ann. Missouri Bot. Gard. 40(4): 271-401 (1953) - sub Polyblastiopsis; Harris R.C., Michigan Bot. 12: 3-68 (1973); Harris R.C., More Florida lichens including the 10c tour of the pyrenolichens: 1-192 [84-90],Bronx, NY (1995); Herre A.W.C.T., Rev. Bryol. Lichénol. 22(1-2): 91 93 (1953) - sub
Polyblastiopsis; Riedel H., Oesterr. Bot. Z. 119: 41 67 (1971) - sub
Polyblastiopsis Zahlbr.; Singh A., Nova Hedwigia 36: 237-239 (1982) -
sub Polyblastiopsis; Upreti D.K. & Singh A., Brunonia 10: 225-229
(1987) - sub Polyblastiopsis.

Biogeography: Checklist records: Australia, Austria, Germany, Great Britain, Guianas, Italy, Sonoran Desert, and United States and Canada (continental).

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

Thallus: Indistinct, not subdivided parts, granular. Upper Surface: Grey or brownish yellow; special structures absent; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface; special structures absent; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, becoming adnate to soon sessile. Wall: Not carbonized, not fused. Margin: Prominent; external filaments absent. Exciple: Brown or olive. Periphyses: Absent. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed. Hypothecium: White.

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

Ascospores: 1–2 to c. 8 per ascus, ellipsoid, fusiform, cylindrical, or ovoid, 13-65 µm long, 7-22 µm wide, obtuse; septa present; both transversally and longitudinally, 5-11-transversally septate, formed by the proper spore wall; wall thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidia: Filiform or bacilliform; microconidial, not branched; aseptate; cell wall hyaline.

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