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Data Set Maintenance: Data set standard item. Data set author(s): Hertel H. (00-06-07). Data set not revised.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: species. Lecidea. Synonyms: Lecidea atrolutescens Nyl. in Hasse; Lecidea kalbii Hertel; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Tuckerman E., Synopsis North Amer. Lich. 2: 75 (1888); type specimen label data: USA, California, Mt. Diabolo, H. Mann (FH-Tuck, holotype).

Taxonomic Literature: Magnusson A.H., Acta Horti Gothob. 10: 17 (1936); Hertel H., Herzogia 2: 490-492 (1973); Hertel H., Beih. Nova Hedwigia 79: 418-419 (1984); Hertel H., Mitt. Bot. München 28: 221 (1989); Hertel H., Symb. Bot. Upsal. 32(1): 105-106 (1997).

Biogeography: Colline and montane. Continent: Northern America (USA (Cal, Oregon, Wash), Mexico) and Southern America (Chile, Argentina).

Thallus: Areolate (primarily areolate), subsquamulose, continuous throughout or dispersed along the periphery, continuous in the centre; lobes angular or rounded at the front; separate thallus parts.18-.8 mm thick. Thallus Size and Differentiation: Large; main branches basally not constricted to basally constricted. Thallus Outline: Margin brighter than disk to concolorous to darkened the thallus centre. Upper Surface: Brown to brownish yellow to red (sometimes with a tinge of green), convoluted, plane to convex; not sorediate; without thalloconidia thalloconidia.

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

Ascocarps: Soon sessile, not constricted to slightly constricted at the base, 10-150 per cm², .5-1.4-(3) mm in diam.. Margin: Not flexuose to slightly flexuose, persistent to excluded, 60-80 µm wide, epruinose. Disk: Plane to strongly convex to weakly convex, black, epruinose, pruina normally scarce or rarely abundant, without an umbo. Exciple: Hyphae radiating outwards; 2.5-4 µm wide; black or grey; inspersed with crystals (very dense). Epithecium: Apical cells green (dull olive green), turquoise (very rarely), or olive, cell pigment reacting with 10% HCl (in H2O), cell pigment HCl+ blue (week to indistinct). Hymenium: (47)-53-68-(86) µm high; white; iodine reaction: Lugol’s positive. Subhymenium: 25-(often not separable fom hypothecium)-50 µm high; white. Hypothecium: White or brownish yellow (usually very pale).

Ascospores: Ellipsoid or oblong, (7)-9.8-14.9-(22) µm long, (4.5)-4.8-6.6-(9) µm wide; wall not ornamented.

Secondary Metabolites: Present, gyrophoric acid (major), lecanoric acid (minor), or schizopeltic acid (usually present).

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

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