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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 1. Tasmidella. Megalariaceae Hafellner (1984); Lecanorineae; Lecanorales.

Taxonomic Literature: Kantvilas G., Hafellner J. & Elix J.A., Lichenologist 31(3): 213-225 (1999).

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Crustose, not subdivided parts, granular, rimose, or areolate (primarily areolate). Thallus Outline: Persistent. Upper Surface: Grey, brownish yellow, or olive; special structures absent. Lower Surface: Attached by the whole lower surface; special structures present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

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, soon sessile. Wall: Not fused. Margin: Prominent; external filaments absent. Exciple: Black, green, or white. Periphyses: Absent. Epithecium: Apical cells green. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Asci: Tholus thickened, amyloid, with non-amyloid wide axial body and divergent amyloid flanks towards apex; ocular chamber indistinct; dehiscence lecanoralean; exoascus euamyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid, oblong-obtuse, or reniform, (14)-15-20-(21) µm long, 6-8 µm wide; wall thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, in Lugol's Solution negative, wall not ornamented.

Secondary Metabolites: Present, of the following substance class(es): ß-orcinol depsides and xanthones.

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