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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 leptoboloides Nyl., L. lithophiloides Nyl. nom. illegit. (non Müll.Arg.), Lecidea lithophilopsis Nyl.; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Müller-Argau J., Flora 57: 187-188 (1874); type specimen label data: Switzerland, Wallis: In pascuis alpinis ad parietes verticales saxorum prope lacum Champey supra Orsières, J. Müller-Argau (G, holotype).

Taxonomic Literature: Hertel H., Biblioth. Lichenol. 58: 161 (1995) - sub Lecidea leptoboloides: Hertel H., Decheniana 127: 69 (1975); Nowak J., Tobolewski Z., Porosty Polskie (Warszawa & Kraków) 553 (1975); Hertel H., Khumbu Himal 6: 258-262 (1977); Culberson C.F., Hertel H. 82: 192-196 (1979).

Biogeography: Colline, montane, and alpine. Continent: Europe (Cz, Ga, He, Rm, Su), Northern America (Greenland, Canada (Alberta, NWT, Ontario, Saskatchewan), USA (Cal, Colo, S. Dakota)), Southern America (Chile), Asia-Temperate (Turkey, Afghanisatan, Nepal, MVR), and Australasia.

Ecology: Biotroph; lichenized; endosubstratic or episubstratic (rarely with a distinct epilithic thallus); substrate non-calciferous.

Thallus: Not subdivided parts, continuous throughout, dispersed along the periphery, continuous in the centre, or dispersed throughout and distinctly seperate; lobes angular at the front; separate thallus parts 0-.25 mm thick. Thallus Size and Differentiation: Large; main branches basally not constricted. Thallus Outline: Margin concolorous the thallus centre. Upper Surface: White, plane; not sorediate; without thalloconidia thalloconidia.

Medulla: Iodine reaction in Lugol's solution negative or rarely in Lugol's solution positive.

Ascocarps: Soon sessile, slightly constricted or strongly constricted at the base, 7-100 per cm², .6-1.1-(1.8) mm in diam.. Margin: Not flexuose or slightly flexuose, persistent or excluded, 50-180 µm wide, epruinose. Disk: Plane or weakly convex, black, epruinose, pruina scarce, without an umbo. Exciple: Hyphae radiating outwards; 3-4 µm wide; grey or yellow (beige-gray); inspersed with crystals (especially marginally). Epithecium: Apical cells olive to green to brown, cell pigment reacting with 10% HCl (in H2O). Hymenium: 37-58 µm high; white or very rarely pink (rosé); iodine reaction: Lugol’s positive. Subhymenium: 14-50 µm high; white. Hypothecium: Normally white or brownish yellow.

Ascospores: Ellipsoid, oblong, cylindrical, or oblong-obtuse, (5)-8-11.5-(15.5) µm long, (2)-2.5-3.7-(4.5) µm wide; wall not ornamented.

Secondary Metabolites: Rarely not detected or present, 4-O-demethylplanaic acid (usually present).

Spot Tests: Medulla: K –, C –, PD – ascocarp margin (in section): K –, C – disk: C – hypothecium: K – epihymenium: K –.

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