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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 jemtlandensis H.Magn., Lecidea lithophiloides Müll.Arg., Lecidea metamorpha Anzi, Lecidea peralbida (Th.Fr.) H.Olivier; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Nylander W., Not. Sällsk. Fauna Fl. Fenn. Förh. 4: 240 (1859); type specimen label data: Finland: ad saxa granitica insularum Alandiae, E. Nylander.

Taxonomic Literature: Taxonomic notes: A very critical taxon of the Lecidea lapicida complex. Hertel H., Herzogia 2: 49 (1970); Hertel H., Mitt. Bot. München 12: 468-469 (1976); Hertel H., Mitt. Bot. München 17: 178 (1981); Clauzade G., Roux C., Bull. Soc. Bot. Centre-Ouest, nouv. ser., num. spec. 7: 459 (1985); Türk R., Wittmann H., Sauteria 3: 229 (1987 - distrib. map for Salzburg, Austria); Türk R., Poelt J., Österr. Akad. Wiss., Biosystematics and Ecology Ser. 3: 65 (1993 - bibliography of Austrian lichens); Hertel H, Biblioth. Lichenol. 58: 174 (1995); Brodo I.M., Mycotaxon 56: 154 (1995).

Biogeography: Colline and montane. Continent: Europe (Au, Br, Is, It, Rs, Su), Northern America (Greenland, Canada), and Southern America (Argentina).

Ecology: Biotroph; lichenized; episubstratic; substrate non-calciferous or metalliferous.

Thallus: Not subdivided parts, areolate (primarily areolate), continuous throughout; lobes angular at the front; separate thallus parts.2-.7 mm thick. Thallus Size and Differentiation: Large; main branches basally not constricted. Thallus Outline: Margin concolorous the thallus centre. Upper Surface: White to lemon (citrine), plane to convex; not sorediate; without thalloconidia thalloconidia.

Ascocarps: Soon sessile, slightly constricted to strongly constricted at the base, 40-120 per cm², .5-1.2-(1.7) mm in diam.. Margin: Not flexuose, persistent to excluded, 40-100 µm wide, epruinose. Disk: Plane to weakly convex to strongly convex, black, epruinose, without an umbo. Exciple: Hyphae radiating outwards; 3.5-4.5 µm wide; grey; inspersed with crystals. Epithecium: Apical cells olive, cell pigment reacting with 10% HCl (in H2O). Hymenium: 50-60 µm high; white; iodine reaction: Lugol’s positive. Subhymenium: 17-35 µm high; white. Hypothecium: Brown to dark brown.

Ascospores: Broadly ellipsoid to ellipsoid, (7.5)-8.8-12.7-(16) µm long, (4)-5.1-6.5-(7) µm wide; wall not ornamented.

Secondary Metabolites: Not detected to present, norstictic acid to stictic acid (traces).

Spot Tests: Medulla: K + red, C –, PD – to + orange; ascocarp margin (in section): K + red, C – disk: C – hypothecium: K – epihymenium: K –.

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