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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. (02-05-17); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 12-15. Thyrea. Lichinaceae Nyl. (1854); Lichinales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero

Special 7: 1-893 [747-751] (1985); Henssen A., Mycotaxon 25: 493-
503
(1986); Henssen A. & Jørgensen P.M., Lichenologist
22: 137- 147 (1990); Henssen A., Büdel B. & Wessels D.,
Mycotaxon 22: 169-195 (1985); Morreno P.P. & Egea J.M., Acta Bot.
Barc. 41: 1- 66 (1992); Poelt J., Bestimmungsschlüssel
Europäischer Flechten: 1-757 [659-661] (1969); Schultz M. in:
Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert
Region vol. 1, 485-487, Tempe (2002).

Biogeography: Checklist records: Austria, Germany, Italy, Sonoran Desert, Sweden and Norway, United States and Canada (continental), and Republic of South Africa.

Lichen Photobionts: Primary photobiont present; cyanobacterial. Primary photobiont taxonomy: Gloeocapsa (A. Beck 19-05-97); Chroococcales, Cyanobacteria, Prokaryota. Secondary photobiont absent.

Thallus: Crustose or foliose, not subdivided parts, squamulose or subfruticose, umbilicate or lobed. Thallus Outline: Soon disappearing. Upper Surface: Black, grey, brown, or olive; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate or isidiate; not sorediate; not cephalodiate; not lobulate; 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 or directly at the thallus margin, not emerging, becoming adnate. Wall: Not carbonized, not fused. Margin: Indistinct or distinct; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells brownish yellow (faintly). Hymenium: Iodine reaction: Lugol’s negative, 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, 5-15 µm long, 3-14 µm wide, obtuse; septa absent; wall thin (occasionaly thickened), not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented (occasionaly thickened).

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

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

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