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Data Set Maintenance: Data set compiled. Data set author(s): Kainz C. (01-09-05). Data set reviewer(s): Knoph J.-G.; revised @EXCL@ not revised (03-10-10); to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Lecidella. Lecanoraceae Körb. (1855); Lecanorales.

Taxonomic Literature: Knoph, J.-G., Garnitz, R. & Leuckert, C., Mycotaxon 71: 163-168
(1999).

Thallus: Crustose, not subdivided parts, rimose; separate thallus parts thin (up to 0.2 mm). Thallus Size and Differentiation: Up to 1 cm long. Thallus Outline: Soon disappearing or persistent (rarely at the thallus margin, up to 0.1 mm thick); black. Upper Surface: White or lemon (citrine), rough.

Medulla: Iodine reaction in Lugol's solution negative or in Lugol's solution positive (at some parts of the medulla).

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, becoming adnate to soon sessile, slightly constricted at the base, .2-.25 mm in diam.. Margin: Lecideine/biatorine, distinct (from the beginning). Disk: Plane, black, epruinose. Exciple: Carbonized; weakly brown or white. Parathecium (proper excipulum): White. Amphithecium (thalline excipulum): Present. Epithecium: Apical cells distinctly swollen (c. 3 µm diam.), pale green or dark brown. Hymenium: 55-85 µm high; white; oil inspersed. Interascal Hyphae: Scarcely branched or distinctly branched (rarely), not or scarcely anastomosed. Hypothecium: White.

Secondary Metabolites: 2,5,7-trichloro-3-O-methylnorlichexanthone, 3-O-methylasemone (= 4,5,7-trichloro-3-O-methylnorlichexanthone), 5,7-dichloro-3-O-methylnorlichexanthone, atranorin, or isoarthothelin (= 2,5,7-trichloronorlichexanthone) (trace in one specimen ?).

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