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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Scholz P. (02-05-16); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 8. Rhizoplaca. Lecanoraceae Körb. (1855); Lecanorineae; Lecanorales.

Type Information: Type: Rhizoplaca melanophthalma (DC.) Leuckert & Poelt [= R. opaca (Ach.) Zopf].

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero
Special 7: 1-893 [678-679] (1985); Elix J.A., Bryologist 96: 359-383
(1993); Leuckert Ch., Poelt J. & Haehnel, G., Nova Hedwigia 28:
71-129 (1976); Lumbsch H.T., Schmitz K.E. & Feige G.B., Mycotaxon
42: 77-87 (1991); McCune B., Bryologist 90: 6-14 (1987); Poelt J. & Vezda A., Biblioth. Lichenol. 9: 1-258 [233-235] (1977); Ryan B.D. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 442-448, Tempe (2002).

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

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Trebouxia (A. Beck 22-05-97); Trebouxiaceae; Trebouxiales, Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Crustose or foliose, not subdivided parts, placodioid or squamulose, umbilicate. Upper Surface: Green or yellow; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia or with thalloconidia thalloconidia. Lower Surface: Attached by holdfasts; special structures absent.

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

Ascospores: c. 8 per ascus, broadly ellipsoid, ellipsoid, ovoid, or semilunate, 8-13-(20) µm long, 4-8-(10) 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 or along the thallus periphery.

Secondary Metabolites: Present, of the following substance class(es): ß-orcinol depsides, ß-orcinol depsidones, (higher) aliphatic acids, (tri-)terpenoids, and dibenzofurans [and usnic acids].

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