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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: 1. Stromatella. Lichinaceae Nyl. (1854); Lichinales.

Taxonomic Literature: Henssen A., Lichenologist 21: 101-118 (1989); Schultz M. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 475-476, Tempe (2002).

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

Thallus: Crustose, squamulose, granular, rimose (sometimes almost tessellate), or areolate (primarily areolate). Thallus Outline: Soon disappearing. Upper Surface: Black, brown, or olive; special structures absent. Lower Surface: Attached by the whole lower surface or 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, not emerging, becoming adnate, stromatic (uncertain). Wall: Not carbonized, not fused. Margin: Indistinct to distinct; external filaments absent. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells hyaline or brownish yellow. Hymenium: Iodine reaction: Lugol’s negative, hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

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

Ascospores: c. 8 per ascus, broadly ellipsoid or ellipsoid, 12-26 µm long, 8-11 µm wide, obtuse; septa absent; wall thin, 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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