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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (01-06-19). Data set reviewer(s): Knoph J.-G.; revised (03-10-22); to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Lecidella. Synonyms: Lecidella incongruella (Vain.) Hertel & Leuckert; Lecidella
albidicinerella (Vain.) Poelt & Vezda; Lecidea euphorea (Flk.)
Nyl. f. saxicola Räs.; Lecanoraceae Körb. (1855); Lecanorales.

Type Information: Basionym: Lecidea effugiens B. Nils. 1907. Die Flechtenvegetation des Sarekgeb.: 27-28.

Taxonomic Literature: Knoph, J.-G. (1990): Untersuchungen an gesteinsbewohnenden xanthonhaltigen Sippen der Flechtengattung Lecidella (Lecanoraceae, Lecanorales) unter besonderer Berücksichtigung von außereuropäischen Proben exklusive Amerika; Bibl. Lichenol. 36: 1-183 [139-150].
Leuckert, C., Knoph, J.-G. & Hertel, H. (1992): Chemotaxonomische Studien in der Gattung Lecidella (Lecanorales, Lecanoraceae) II. Europäische Arten der Lecidella asema-Gruppe. - Herzogia 9: 1-17 [6-7].
Knoph, J.-G. & Leuckert, C. (1994): Chemotaxonomic studies in the saxicolous species of the lichen genus Lecidella (Lecanoraceae, Lecanorales) in America. - Nova Hedwigia 59: 455-508 [476-479].

Biogeography: Continent: Africa, Asia-Temperate, Europe, Northern America, and Southern America.

Thallus: Crustose, areolate (primarily areolate), strongly bullate; separate thallus parts thin or thick (up to 1.0 mm). Thallus Outline: Soon disappearing or persistent (rarely as thin margin of single areoles visible); black. Upper Surface: Pale grey or lemon (citrine), matt or weakly glossy (shiny).

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Soon sessile, slightly constricted or strongly constricted at the base, .4-.7-1 mm in diam.. Margin: Lecideine/biatorine, excluded, indistinct or distinct. Disk: Plane, strongly convex, or weakly convex, black, epruinose. Exciple: Carbonized; white or strongly dark green. Parathecium (proper excipulum): Brownish red, inspersed with crystals (sometimes). Amphithecium (thalline excipulum): Present; photobiont absent. Epithecium: Apical cells slightly swollen, green or dark green. Hymenium: Green (sometimes partly) or white. Hypothecium: Brownish red.

Ascospores: c. 8 per ascus, broadly ellipsoid, 10-16 µm long, 6-9 µm wide; septa absent; wall thick (not halonate), distinctly differentiated into primary and secondary wall (not halonate), not ornamented (not halonate).

Secondary Metabolites: 2,5,7-trichloro-3-O-methylnorlichexanthone, 3-O-methylasemone (= 4,5,7-trichloro-3-O-methylnorlichexanthone), 3-O-methylthiophanic acid (= 2,4,5,7-Tetrachloro-3-O-methylnorlichexanthone), 5,7-dichloro-3-O-methylnorlichexanthone, atranorin, chloroatranorin, isoarthothelin (= 2,5,7-trichloronorlichexanthone), or thiophanic acid (= 2,4,5,7-tetrachloronorlichexanthone), of the following substance class(es): xanthones.

Spot Tests: Upper surface: K – (negative) or + deep yellow (rarely), C – or + orange, PD – or + yellow (rarely).

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