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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: accepted. Taxonomic rank: species. Lecidea. Synonyms: Lecidea complicata H.Magn., Lecidea pruinosula H.Magn., L. pseudopilati (Vain.) Vain., Lecidea lactea var. ecrustacea (Anzi ex Arnold) Clauzade & Roux; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Arnold F., Verh. Zool.-Bot. Ges. Wien 26: 359 (1876) - Lecidella polycarpa var. ecrustacea Anzi ex Arnold: Arnold F., Verh. Zool.-Bot. Ges. Wien 18: 954 (1868); type specimen label data: Italy, Prov. Sondrio, ad rupes micaceas in alpibus Rhaeticis editissimis (monte Stelvio), 2900 m, M. Anzi (Anzi, Lich. Langob. 399: M, lectotype).

Taxonomic Literature: Taxonomic notes: A still very critical taxon of the Lecidea lapicida complex. Hertel H., Herzogia 2: 236-237 (1971); Hertel H., Herzogia 2: 484 (1973); Hertel H., Decheniana 127: 65 (1975); Nowak J., Tobolewski Z., Porosty Polskie (Warszawa & Kraków) 549 (1975); Hertel H., Mitt. Bot. München 13: 344 (1977); Hertel H., Biblioth. Lichenol. 58: 158 (1995).

Biogeography: Alpine. Continent: Europe (Au, Br, Ge, Fe, He, Hs, It, No, Rm, Rs, Sb, Su), Northern America (Canada: N.W.T.), and Southern America (Andes of Venezuela).

Thallus: Not subdivided parts, dispersed throughout and distinctly seperate; lobes angular at the front; separate thallus parts 0 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.

Ascocarps: Soon sessile, slightly constricted or strongly constricted at the base, 20-100 per cm², .7-1.4-(2.6) mm in diam.. Margin: Not flexuose, slightly flexuose, or strongly flexuose, persistent or excluded, 60-160 µm wide, epruinose. Disk: Plane to strongly convex, black, epruinose, pruina scarce, without an umbo. Exciple: Hyphae radiating outwards; 2.7-3.3 µm wide; grey; inspersed with crystals. Epithecium: Apical cells olive, green, or rarely turquoise, cell pigment reacting with 10% HCl (in H2O). Hymenium: 45-65 µm high; white; iodine reaction: Lugol’s positive. Subhymenium: 20-50 µm high; white. Hypothecium: Brown.

Ascospores: Ellipsoid, (9)-11-12.9-(16) µm long, (4)-4.9-6.2-(7) µm wide; wall not ornamented.

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

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