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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 confoederata Zahlbr., Lecidea irrubens Zahlbr., Lecidea vexillaris Zahlbr., Zosterodiscus lygomma (Nyl.) Hertel; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Nylander W. in Crombie J.M., J. Bot., London 13: 334 (1875); type specimen label data: Kerguelen, Observatory Bay, A.E. Eaton (BM, lectotype).

Taxonomic Literature: Hertel H., Beih, Nova Hedwigia 79: 425-426 (1984); Hertel H., Mitt. Bot. München 23: 327-329 (1987); Hertel H., Mitt. Bot. München 28: 223-224 (1989); Rambold G., Biblioth. Lichenol. 34: 214-219 (1989).

Biogeography: Subantarctic (Auckland I., Campbell I., Kerguelen, Macquarie I., Prince Edward Isl., South Georgia); montane and alpine. Continent: Southern America (Argentina) and Australasia (Australia (Australian Alps), N.Z. (Canterbury, East Cape, Nelson, Westland, Otago, Southland, Wellington)).

Thallus: Not subdivided parts, areolate (primarily areolate), continuous throughout or dispersed along the periphery, continuous in the centre; lobes angular at the front; separate thallus parts.1-1.2 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, grey (pale to dark), or red (rusty coloured by Fe), plane; not sorediate; without thalloconidia thalloconidia.

Ascocarps: Not emerging, soon sessile or becoming adnate, not constricted or slightly constricted at the base, 10-120 per cm², .5-1.5-(4.3) mm in diam.. Margin: Not flexuose, persistent or excluded, 15-130 µm wide, epruinose or distinctly pruinose. Disk: Plane to strongly convex, black, epruinose, pruina scarce, without an umbo. Exciple: Hyphae radiating outwards; 3-4 µm wide; grey or yellow; not inspersed with crystals or inspersed with crystals. Epithecium: Apical cells olive, green, rarely turquoise, or rarely brown, cell pigment reacting with 10% HCl (in H2O). Hymenium: 55-(mean of 46: 68)-85 µm high; white; iodine reaction: Lugol’s positive. Subhymenium: 15-30 µm high; white or rarely pale green. Hypothecium: Brown or dark brown.

Ascospores: Ellipsoid, (7)-8.3-14.4-(20) µm long, (3.5)-4.8-7-(8.5) µm wide; wall not ornamented.

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

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