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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Triebel D. (00-11-6); not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 3. Icmadophila. Icmadophilaceae Triebel (1993); Leotiales.

Taxonomic Literature: Taxonomic notes: Galloway (2000) synonymized Knightiella with Icmadophila and
recombined Icmadophila splachnirima (Hook. f. & Taylor) D.J.
Galloway. This is still not followed here. Galloway D.J., Lichenologist 32: 294-297 (2000); James P.W. &
Brightman F.H. in: Purvis O.W. et al. (eds), The
Lichen Flora of
Great Britain and Ireland, London (1992); Rambold G.,
Triebel D.
& Hertel H., Biblioth. Lichenol. 53: 217-240 (1993).

Biogeography: Checklist records: Austria, Germany, Great Britain, Italy, New Zealand, Sweden and Norway, United States and Canada (continental), and Republic of South Africa.

Lichen Photobionts: Primary photobiont present. Primary photobiont taxonomy: Coccomyxa (A. Beck 22-05-97); genus incertae sedis; family of unknown placement (incertae sedis), Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Crustose, not subdivided parts, granular. Thallus Outline: Soon disappearing or persistent. Upper Surface: Grey, green, or white; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate or sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface; special structures absent or present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular or lingulate, forming all across the thallus surface or directly at the thallus margin, soon sessile or stipitate. Margin: Distinct to prominent; external filaments absent. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells brown. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

Ascospores: c. 8 per ascus, ellipsoid, fusiform, or allantoid, 13-27 µm long, 4-6 µm wide; septa present; transversally septate, 1-3-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.

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

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