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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:-; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Fries T.M., Bot. Notiser 1865: 110 (1865); type specimen label data: Sweden, Västergötland, Billingen, på hyperit-lager, August 1864, P.T. Cleve (UPS, holotype).

Taxonomic Literature: Taxonomic notes: Variability of characters very insufficiently known. Fries T.M., Lichenogr. Scand. 561-562 (1874); Magnusson H., Bot. Notiser 108: 33 (1955); Hertel H., Decheniana 127: 62 (1975); Nowak J., Tobolewski Z., Porosty Polskie (Warszawa & Kraków) 567 (1975); Clauzade G., Roux C., Bull. Soc. Bot. Centre-Ouest, nouv. ser., num. spec. 7: 470 (1985); Hertel H., Biblioth. Lichenol. 58: 153-154 (1995).

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

Thallus: Not subdivided parts, granular, 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-.1 mm thick. Thallus Size and Differentiation: Large; main branches basally not constricted. Thallus Outline: Margin concolorous the thallus centre. Upper Surface: White, lemon (citrine), brownish yellow, or pale grey, plane; not sorediate; without thalloconidia thalloconidia.

Ascocarps: Soon sessile, slightly constricted or strongly constricted at the base, 150-250 per cm², .2-.35-(.35) mm in diam.. Margin: Not flexuose, indistinct, 20-35 µm wide, epruinose. Disk: Plane or weakly convex, black, epruinose, without an umbo. Exciple: Hyphae radiating outwards; grey; not inspersed with crystals. Epithecium: Apical cells turquoise, cell pigment reacting with 10% HCl (in H2O), cell pigment HCl+ blue. Hymenium: 25-35 µm high; pale green; iodine reaction: Lugol’s positive. Subhymenium: 0-8 µm high; white or pale green. Hypothecium: White.

Ascospores: Ellipsoid, (5)-6-7-(9) µm long, (2)-2-2.5-(3) µm wide; wall not ornamented.

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

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