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Data Set Maintenance: Data set standard item. Data set author(s): Hertel H. (99-01-01). Data set not revised.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: species. Lecidea. Synonyms: Lecidea subsilacea Nyl.; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Acharius E., Method. Lich. 48 (1803). See: Santesson R., The lichens and lichenicolous fungi of Sweden and Norway, 116 (1993).

Taxonomic Literature: Fries T.M., Lichenogr. Scand. 487-488 (1874); Vainio E.A., Acta Soc. Fauna Fl. Fenn. 57(2): 115-116 (1934); Nowak J., Tobolewski Z., Porosty Polskie (Warszawa & Kraków) 547-548 (1975); Huneck S., Z. Naturforschg. 21b: 81 (1966); Hertel H., Khumbu Himal 6: 276-277 (1977); Hertel H., Herzogia 4: 378 (1977); Clauzade G., Roux C., Bull. Soc. Bot. Centre-Ouest, nouv. ser., num. spec. 7: 457 (1985); Schwab A.J., Mitt. Bot. München 22: 351-361 (1986); Türk R., Wittmann H., Sauteria 3: 229 (1987 - distrib. map for Salzburg, Austria); Hertel H., Mitt. Bot. München 30: 312-313 (1991); Hawksworth D.L., Coppins B.J. in Purvis O.W. et al. 335 (1992); Türk R., Poelt J., Österr. Akad. Wiss., Biosystematics and Ecology Ser. 3: 65 (1993 - bibliography of Austrian lichens); Goward T., Thor G., Bryologist 95: 35 (1992); Hertel H., Biblioth. Lichenol. 58: 171-172 (1995); Wirth V., Flechtenflora, 2.Aufl., 391 (1995); Wirth V., Flechten Baden-Württembergs, Teil 1, 511 [Foto!], 514, 516 (1995).

Biogeography: Montane and alpine. Continent: Europe (Au, Br, Bu, Cz, Fe, Ga, Ge, He, Is, It, No, Po, Rs, Sb, Su), Northern America (Greenland, Canada (B.C., N.W.T, Yukon), USA (Colo)), Asia-Temperate (Siberia, Nepal), and Australasia.

Thallus: Areolate (primarily areolate), continuous throughout, dispersed along the periphery, continuous in the centre, or dispersed throughout and distinctly seperate; lobes rounded at the front; separate thallus parts (.2)-.3-1-(1.4) mm thick. Thallus Size and Differentiation: Large; main branches basally not constricted or basally constricted. Thallus Outline: Margin concolorous the thallus centre. Upper Surface: Red (rust-red), convex; not sorediate; without thalloconidia thalloconidia.

Ascocarps: Soon sessile, slightly constricted or strongly constricted at the base, 15-100 per cm², .5-.8-(2) mm in diam.. Margin: Not flexuose, persistent or excluded, 40-80 µm wide, rarely epruinose. Disk: Plane, weakly convex, or strongly convex, black, epruinose, without an umbo. Exciple: Hyphae radiating outwards; 2.5-4 µm wide; grey; not inspersed with crystals or inspersed with crystals. Epithecium: Apical cells green or turquoise, cell pigment reacting with 10% HCl (in H2O), cell pigment HCl+ blue. Hymenium: 45-65 µm high; white or pale green; iodine reaction: Lugol’s positive. Subhymenium: 20-40 µm high; white or pale green. Hypothecium: Brownish yellow or brown.

Ascospores: Ellipsoid, (7)-8.3-10.1-(14) µm long, (4.5)-5.2-6.1-(7) µm wide; wall not ornamented.

Secondary Metabolites: Not detected or present, stictic acid or porphyrilic acid.

Spot Tests: Medulla: K – or rarely + yellow, C –, PD – or rarely + orange; ascocarp margin (in section): K –, C – disk: C – hypothecium: K – epihymenium: K – or + green.

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