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Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Scholz P. (02-05-14, 06-06-12) and Triebel D. (98-01-01); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 10. Collemopsidium. Genus of unknown placement (incertae sedis); Dothideales.

Taxonomic Literature: Grube M., Phyton (Horn) 45(2): 305-318 (2005); Grube M. & Hafellner J., Nova Hedwigia 51: 283-360 [292, 331-333, 350, 354] (1990); Grube M. & Ryan B.D. in Nash T.H. et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 162-164, Tempe (2002); Henssen A., Ber. Deutsch. Bot. Ges. 92: 483-506 (1980) [.

Biogeography: Checklist records: Austria, Sonoran Desert, and Sweden and Norway.

Ecology: Biotroph; algicolous, lichenized, or lichenicolous; substrate non-calciferous or calciferous.

Lichen Photobionts: Primary photobiont absent or present; cyanobacterial. Primary photobiont taxonomy: Hyella; genus incertae sedis; family of unknown placement (incertae sedis), Cyanobacteria, Prokaryota. Secondary photobiont absent.

Thallus: Indistinct or crustose, not subdivided parts, granular or areolate (primarily areolate). Upper Surface: Black or brown; special structures absent. Lower Surface: Attached by the whole lower surface; 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: Perithecioid, orbicular, forming all across the thallus surface, not emerging, becoming adnate to soon sessile. Margin: External filaments absent. Exciple: Red, violet, or brown. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: Red, brownish yellow, or brown.

Asci: Tholus thickened, not amyloid; dehiscence bitunicate; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid, ovoid, oblong-obtuse, or oblong, 11.5-24 µm long, 3.5-9-(10) µm wide, obtuse or aciculate; septa present; transversally septate, 1-transversally septate; 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: Globose, ellipsoid, or bacilliform; aseptate.

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