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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Schultz M. (00-03-02) and Scholz P. (02-05-16); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 12. Paulia. Lichinaceae Nyl. (1854); Lichinales.

Type Information: Type: Paulia pullata Fée, nom. illeg. [= Gyrophora perforata Pers. = Paulia perforata (Pers.) Asahina].

Taxonomic Literature: Fée A.L.A., Linnaea 10: 466-472 (1836); Henssen A., Ber. Deutsch. Bot. Ges. 92: 483-506 (1980) ["1979"]; Henssen A., Lichenologist 18: 201-229 (1986); Henssen A. & Jørgensen P.M., Lichenologist 22: 137-147 (1990); Henssen A, & Tretiach M., Nova Hedwigia 60(1-2): 297-309 (1995); Schultz M. & Tretiach M. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 329-331; Schultz M., Mies B. & Al-Gifri A.N., Bryologist 102(1): 61-66 (1999); Schultz M., Büdel B. & Elix J.A., Austral. Lichenol. 46: 29-30 (2000); Tretiach M.
& Henssen A., Mycotaxon 57: 359-369 (1996).

Biogeography: Checklist records: Italy, Sonoran Desert, and United States and Canada (continental).

Lichen Photobionts: Primary photobiont present; cyanobacterial. Primary photobiont taxonomy: Chroococcales, Cyanobacteria, Prokaryota. Secondary photobiont absent.

Thallus: Crustose, foliose, or fruticose, not subdivided parts, squamulose, placodioid, subfruticose, or rimose, umbilicate. Thallus Outline: Soon disappearing. Upper Surface: Black, grey, green, or brown; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate; not cephalodiate; not lobulate or lobulate (sometimes); without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by holdfasts; special structures absent.

Medulla: Iodine reaction in Lugol's solution negative; not different with or without KOH pre-treatment (euamyloid).

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, forming all across the thallus surface, directly at the tip of the thallus parts, not emerging, becoming adnate. Wall: Not carbonized, not fused. Margin: Indistinct to distinct; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells hyaline or brownish yellow. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid or hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Asci: Tholus not thickened, not amyloid; ocular chamber indistinct; dehiscence prototunicate; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, globose, broadly ellipsoid, or ellipsoid, 9.5-21.5 µm long, 6-14 µm wide, obtuse; septa absent; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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

Conidiogeneous Cells: Apical. Conidia: Ellipsoid or bacilliform; microconidial, not branched; aseptate; cell wall hyaline.

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