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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: 5. Immersaria. Porpidiaceae Hertel & Hafellner (1984); Cladoniineae; Lecanorales.

Taxonomic Literature: Calatayud V. & Rambold G., Lichenologist 30(3): 231-244 (1998); Esnault J. & Roux C., Anales Jard. Bot. Madrid 44: 211-225 (1987) - sub Amygdalaria; Rambold G., Biblioth. Lichenol. 34: 1-346 (1989); Rambold G. & Triebel D., Biblioth. Lichenol. 48: 1-201 [107] (1992).

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

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

Lichen Photobionts: Primary photobiont present; chlorococcal. Secondary photobiont absent.

Thallus: Crustose, areolate (primarily areolate). Upper Surface: Brown, grey, or brownish yellow; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

Medulla: Iodine reaction in Lugol's solution positive or in Lugol's solution negative.

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. Margin: Indistinct to distinct; external filaments absent. Exciple: Grey or white. Periphyses: Absent. Epithecium: Apical cells hyaline, brownish yellow, or olive. Interascal Hyphae: Present, scarcely branched, distinctly anastomosed. Hypothecium: Brown, white, or brownish yellow.

Ascospores: c. 8 per ascus, ellipsoid, 13-24 µm long, 6-13 µm wide, obtuse; septa absent; 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.

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

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