Psora Hoffm. (1796)

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Timdal E. (95-04-20, 99-06-02) 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: 30. Psora. Psoraceae Zahlbr. (1898); Cladoniineae; Lecanorales.

Type Information: Type: Psora decipiens (Hedw.) Hoffm.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero

Special 7: 1-893 [643-646] (1985); Galloway D.J., Flora of New

Zealand Lichens: i-lxxiii, 1-662 [463-464], Wellington (1985);
Hertel
H., Khumbu Himal 6: 145-378 (1977); Poelt J. & Vezda A.,
Biblioth. Lichenol. 16: 1-390 [255-257] (1981); Purvis O.W. &
Timdal E. in: Purvis O.W. et al. (eds), The Lichen Flora of Great
Britain and Ireland, London (1992); Schneider G., Biblioth. Lichenol.
13: 1-291 (1979); Timdal E., Nord. J. Bot. 4: 525-540 (1984); Timdal
E., Bryologist 89: 253-275 (1986); Timdal E. in: Nash T.H. III et al.
(eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 418-
430, Tempe (2002).

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

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

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

Thallus: Crustose, squamulose or areolate (primarily areolate). Thallus Outline: Soon disappearing. Upper Surface: Grey, green, yellow, brown, red, white, olive, brownish yellow, or pink (rosé); special structures absent. Lower Surface: Attached by the whole lower surface or attached by holdfasts; special structures absent.

Medulla: Iodine reaction in Lugol's solution negative.

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 or directly at the thallus margin, soon sessile. Margin: Indistinct to distinct; external filaments absent. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells brown, brownish yellow, or orange. Hymenium: Iodine reaction: Lugol’s positive. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

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

Ascospores: c. 8 per ascus, broadly ellipsoid or ellipsoid, 10-20 µm long, 5-10 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.

Conidiogeneous Cells: Apical or intercalar. Conidia: Bacilliform.

Secondary Metabolites: Not detected or present, of the following substance class(es): orcinol depsides, ß-orcinol depsides, ß-orcinol depsidones, (higher) aliphatic acids, (tri-)terpenoids, (anthra-)quinones, pulvinic acid derivatives, and dibenzofurans [and usnic acids].

(report generated 04.Okt.2007)