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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Timdal E. (99-06-01) and 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: 1. Psorula. Psoraceae Zahlbr. (1898); Cladoniineae; Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest, N.S. 7: 1-
893 [649] (1985); Hafellner J. in: Hertel H. & Oberwinkler F.
(eds), Beih. Nova Hedwigia 79: 241-371 [326-327] (1984); Poelt J.,
Ber. Deutsch. Bot. Ges. 79: 259-264 (1966); Poelt J. & Vezda A.,
Biblioth. Lichenol. 16: 1-390 [259] (1981); Rambold G. & Triebel
D., Biblioth. Lichenol. 48: 118 (1992); Schneider G., Biblioth.
Lichenol. 13: 1-291 (1979); Timdal E. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 434-435, Tempe (2002).

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

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

Lichen Photobionts: Primary photobiont present; chlorococcal. Secondary photobiont absent (but occuring on Spilonema revertens).

Thallus: Crustose, squamulose or areolate (primarily areolate). Thallus Outline: Soon disappearing. Upper Surface: Black, brown, or olive; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

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, soon sessile. Margin: Distinct to prominent; external filaments absent. Exciple: Black, green, brown, or olive. Periphyses: Absent. Epithecium: Apical cells dark green or brown. Hymenium: Iodine reaction: Lugol’s positive. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed.

Asci: Tholus thickened, amyloid, with amyloid tube; ocular chamber indistinct; dehiscence lecanoralean; exoascus euamyloid.

Ascospores: c. 8 per ascus, broadly ellipsoid or ellipsoid, (8)-9-12-(15) µm long, 5-7 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; sessile, formed along the thallus periphery.

Secondary Metabolites: Not detected (according to Timdal 2002) or present, of the following substance class(es): orcinol depsides.

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