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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 rimiseda Nyl., Lecidea matildae H.Magn.; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Müller-Argau J., Flora 55: 536 (1872); type specimen label data: Frankreich, Dépt. Haute Savoie, auf siderolithischen Blöcken am Eldorado der Saleve-Höhe, 22 November 1872, J. Müller-Argau, G (holotype).

Taxonomic Literature: Taxonomic notes: Anatomically very similar to Lecidea ochrochlora. L. ochrochlora is however a geographically and ecologically very different xeric Southern hemisphere lowland-species. Hertel H., Decheniana 127: 64 (1975); Hertel H., Biblioth. Lichenol. 58: 156-157 (1995).

Biogeography: Colline, montane, and alpine. Continent: Europe (Fe, Ga, Hi, It).

Ecology: Biotroph; lichenized; endosubstratic or episubstratic (thallus usually scarcely developed); substrate non-calciferous.

Thallus: Not subdivided parts, areolate (primarily areolate), dispersed along the periphery, continuous in the centre or dispersed throughout and distinctly seperate; lobes angular or rounded at the front; separate thallus parts 0-.3 mm thick. Thallus Size and Differentiation: Large; main branches basally not constricted. Thallus Outline: Margin concolorous the thallus centre. Upper Surface: White, grey, or brown (pale beige), plane or convex; not sorediate; without thalloconidia thalloconidia.

Upper Cortex: Epicortex present (very local only). Medulla: Iodine reaction in Lugol's solution negative.

Ascocarps: Soon sessile, not constricted, slightly constricted, or strongly constricted at the base, 30-200 per cm², .25-.7-(.9) mm in diam.. Margin: Not flexuose, persistent or excluded, 45-120 µm wide, epruinose. Disk: Plane to strongly convex, black, epruinose, without an umbo. Exciple: Hyphae radiating outwards; 3.5-5 µm wide; grey or pale brown; not inspersed with crystals or inspersed with crystals (normally with weak inspersion). Epithecium: Apical cells olive, cell pigment reacting with 10% HCl (in H2O). Hymenium: 55-90 µm high; white; iodine reaction: Lugol’s positive, hemiamyloid. Subhymenium: 25-35 µm high; white. Hypothecium: Brown.

Ascospores: Ellipsoid or oblong, (9)-11.1-15.4-(19) µm long, (4.5)-4.9-6.4-(7.5) µm wide; wall not ornamented.

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

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