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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 acosmeta Lettau, Lecidea omphaliza Lettau, Lecidea subumbonata Nyl. (1872), L. umboniza Nadv.; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Mudd W., Manual Brit. Lich. 204 (1861 - nomen sed not planta) - Biatora umbonata Hepp: Hepp P., Flecht. Europas no. 257 (1857); type specimen label data: Switzerland, Pilatus, Ph. Hepp (Hepp, Flecht. Eur. 257: G, lectotype).

Taxonomic Literature: Hertel H., Beih. Nova Hedwigia 24: 37-40 (1967); Hertel H., Herzogia 2: 51-52 (1970); Hertel H., Herzogia 2: 249, 251 (1971); Hertel H., Herzogia 2: 497-499 (1973); Hertel H., Mitt. Bot. München 12: 140 (1975); Nowak J., Tobolewski Z., Porosty Polskie (Warszawa & Kraków) 546 (1975); Hertel H., Herzogia 4: 379, 398 (1977); Andreev M.P., Baibultova N.E., Novit. Syst. Plant. Non Vasc. 22: 169 (1985); Clauzade G., Roux C., Bull. Soc. Bot. Centre-Ouest, nouv. ser., num. spec. 7: 464 (1985); Türk R., Wittmann H., Sauteria 3: 230 (1987 - distrib. map for Salzburg, Austria); Hertel H., Mitt. Bot. München 28: 225 (1989); Hertel H., Mitt. Bot. München 30: 315 (1991); Andreev M.P., Kudratov I., Botan. Zhurn. 77: 107 (1992); Türk R., Poelt J., Österr. Akad. Wiss., Biosystematics and Ecology Ser. 3: 65 (1993 - bibliography of Austrian lichens); Hertel H., Biblioth. Lichenol. 58: 176 (1995).

Biogeography: Alpine. Continent: Europe (Au, Cz (Tatra), Fe, Ga (Alps, Pyrenees), Ge(Alps), He, Hs, It, No, Sb), Northern America (Greenland, Canada (Alberta, N.W.T., Yukon), USA (Alaska, Colorado, Montana, Utah)), Southern America (Terra del Fuego), and Asia-Temperate (Kavkas, Turkey).

Thallus: Not subdivided parts, rarely areolate (primarily areolate), continuous throughout; lobes angular at the front; separate thallus parts.3-1.5 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.

Medulla: Iodine reaction rarely in Lugol's solution negative or in Lugol's solution positive.

Ascocarps: Soon sessile, not constricted, slightly constricted, or strongly constricted at the base, 25-150 per cm², .5-1.3-(2.4) mm in diam.. Margin: Not flexuose, persistent, 45-100 µm wide, epruinose. Disk: Plane, weakly convex, or strongly convex, black, epruinose, without an umbo, forming occasionally, on few disks only or forming regularly, on all disks. Exciple: Hyphae radiating outwards; grey (TEST); not inspersed with crystals. Epithecium: Apical cells olive or green, cell pigment reacting with 10% HCl (in H2O), cell pigment HCl+ blue? Hymenium: 50-70-(80) µm high; white or pale green; iodine reaction: Lugol’s positive. Subhymenium: (25)-35-80-(110) µm high; rarely white or pale green. Hypothecium: White, brownish yellow, or brown.

Ascospores: Ellipsoid, (8)-9-12.8-(16) µm long, (4)-5.1-7-(9) µm wide; wall not ornamented.

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

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