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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: 14. Placidiopsis. Verrucariaceae Zenker (1827); Verrucariales.

Taxonomic Literature: Breuss O., Plant Syst. Evol. 142: 247-250 (1983); Breuss O., Nova
Hedwigia 58: 229-237 (1994); Breuss O., Pl. Syst. Evol. 148: 313-315
(1985); Breuss O. in: Purvis O.W. et al. (eds), The Lichen Flora of
Great Britain and Ireland, London (1992); Breuss O. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 383-384, Tempe (2002); Breuss O. & Hansen E.S., Plant Syst. Evol. 159: 95-105 (1988); Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [606-608] (1985).

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

Ecology: Biotroph; lichenized; terricolous or bryophytic; substrate non-calciferous or calciferous.

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

Thallus: Crustose, not subdivided parts, squamulose. Thallus Outline: Soon disappearing. Upper Surface: Greenish grey, brown, olive, or brownish yellow; special structures absent. Lower Surface: Attached by holdfasts; special structures present:; not pseudocyphellate; not cyphellate; rhizinate; without thalloconidia thalloconidia; not cavernulate; tomentose.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, forming all across the thallus surface, not emerging. Margin: Indistinct; external filaments absent. Exciple: Black, brown, or white. Periphyses: Present. Interascal Hyphae: Absent (or soon disappearing).

Asci: Tholus thickened or slightly not thickened, not amyloid; ocular chamber indistinct; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid or ovoid, 12-23 µm long, 4-10 µm wide, obtuse; septa present; transversally septate, 1-3-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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