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Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): 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: 11. Bacidina. Lecanoraceae Körb. (1855); Lecanorineae; Lecanorales.

Taxonomic Literature: Coenen C., Saxicole Bacidien und Bacidinen Bayerns, Zulassungsarbeit LMU, München (1991); Diederich P., Sérusiaux E. & Boom, P.P.G. van den, Lejeunia 136: 1-47 [13-14] (1991) - sub Bacidia chloroticula; Ekman S., Opera Bot. 127: 1-148 (1996); Poelt J. & Vezda A., Biblioth. Lichenol. 38: 377-394 [389-390] (1990); Vezda A., Folia Geobot. Phytotax. 25: 431-432 (1990).

Biogeography: Checklist records: Austria, Germany, Sonoran Desert, Italy, New Zealand, United States and Canada (continental), and Guianas.

Ecology: Biotroph; lichenized or lichenicolous; terricolous, bryophytic, lignicolous, corticolous, or epiphyllous; substrate non-calciferous or calciferous.

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Chlorella saccharophila-group (A. Beck 22-05-97); genus incertae sedis; Dictyochloropsis-group, Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Crustose, not subdivided parts, granular. Upper Surface: Green, grey, brownish yellow, or olive; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate; not cephalodiate; not lobulate; without granules or with granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface; special structures absent.

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. Margin: Distinct to prominent; external filaments absent. Exciple: Brown or white to brownish yellow to violet. Periphyses: Absent. Epithecium: Apical cells hyaline to brownish yellow to olive. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Brown to white to brownish yellow.

Asci: Tholus thickened, amyloid, with non-amyloid wide axial body and divergent amyloid flanks towards apex; dehiscence lecanoralean; exoascus euamyloid.

Ascospores: c. 8 per ascus, cylindrical to filiform to fusiform, 20-47 µm long, 1.5-3 µm wide, aciculate; septa present; transversally septate, 1-8-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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

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