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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Lumbsch H. T. (94-12-28) and Scholz P. (02-05-18); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 1. Hydrothyria. Peltigeraceae Dumort. (1822); Peltigerineae; Lecanorales.

Taxonomic Literature: Taxonomic notes: according to Miadlikowska & Lutzoni (2000) a species of Peltigera. Feige G.B., Geyer M. & Follmann G., Herzogia 8: 69-75 (1989);
Keuck G., Biblioth. Lichenol. 6: 1-175 (1977); Miadlikowska J. & Lutzoni F., Int. J. Plant Science 161: 925-958 (2000).

Lichen Photobionts: Primary photobiont present; cyanobacterial. Primary photobiont taxonomy: Nostoc (A. Beck 22-05-97); Nostocaceae; Nostocales, Cyanobacteria, Prokaryota. Secondary photobiont absent.

Thallus: Foliose, not subdivided parts, lobed. Upper Surface: Black or grey; special structures absent. 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 lingulate, forming directly at the thallus margin, not emerging, becoming adnate to substipitate. Margin: Indistinct to prominent; external filaments absent. Exciple: White. Periphyses: Absent. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Ascospores: c. 8 per ascus, fusiform, obtuse or aciculate; septa present; transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Secondary Metabolites: Not detected or present, of the following substance class(es): orcinol depsides.

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