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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. Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Magnusson A.H., Acta Horti Gothob. 19(2): 43 (1952); type specimen label data: Canada, N.W.T., Baffin Island, Cape Searle, on basalt of bird cliffs, 17-18 August 1959, M.E. Hale 391 (UPS, holotype).

Ecology: Biotroph; lichenized; episubstratic; substrate non-calciferous (basalt).

Thallus: Not subdivided parts, areolate (primarily areolate), continuous throughout; lobes angular at the front; separate thallus parts.4-1 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.

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

Ascocarps: Soon sessile, slightly constricted or strongly constricted at the base, .6-1.2-(2.2) mm in diam.. Margin: Slightly flexuose, persistent, 100-150 µm wide, epruinose. Disk: Plane, black, epruinose, pruina scarce, without an umbo. Exciple: Grey (TEST); not inspersed with crystals or inspersed with crystals. Epithecium: Apical cells green. Hymenium: 40-50 µm high; white; iodine reaction: Lugol’s positive (TEST). Subhymenium: 0 µm high; white. Hypothecium: White.

Ascospores: Cylindrical, (7.5)-9.5-10.3-(14) µm long, (2.5)-3-3.4-(4) µm wide; wall not ornamented (TEST).

Spot Tests: Medulla: K –, C –, PD – ascocarp margin (in section): K –, C – disk: C – hypothecium: K + purplish brown (chinoide reaction).

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