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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (01-06-26). Data set reviewer(s): Kainz C.; revised @EXCL@ not revised (01-09-04); to be published after submission.

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

Type Information: Basionym: Lecidea schistiseda Zahlbr. 1941. Denkschr. Akad. Wiss. Wien, math.-nat. Kl. 104: 300-301.

Thallus: Crustose, not subdivided parts, rimose or nearly areolate (primarily areolate) (sometimes); separate thallus parts thin or thick (0.1-1.0 mm). Thallus Outline: Soon disappearing. Upper Surface: White (creamy), pale grey, or lemon (citrine), glossy (shiny); special structures absent.

Medulla: Iodine reaction in Lugol's solution negative or in Lugol's solution positive (rarely, violet).

Reproduction Strategy: With sexual (and possible asexual) stages (sometimes scanty). Ascocarps: Soon sessile, slightly constricted or strongly constricted at the base, up to 1.6 mm in diam.. Margin: Lecideine/biatorine, slightly flexuose (when older), persistent, distinct or indistinct (about 0.1 mm). Disk: Plane or weakly convex (when older), black, epruinose. Exciple: Not carbonized; brown, dark blue, or dark green. Parathecium (proper excipulum): White, inspersed with crystals (often). Amphithecium (thalline excipulum): Present. Epithecium: Apical cells slightly swollen, pale green, dark green, or olive (olivaceous, rarely, when damaged ?). Hymenium: White. Hypothecium: White.

Ascospores: c. 8 per ascus, oval, 14-17 µm long, 5.5-6.5 µm wide; septa absent; wall thick (not halonate), distinctly differentiated into primary and secondary wall (not halonate), not ornamented (not halonate).

Secondary Metabolites: Arthothelin (2,4,5-trichloronorlichexanthone), atranorin (+ Dichlornorlichexanthone in traces), or thiophanic acid (= 2,4,5,7-tetrachloronorlichexanthone).

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