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Lecidella stigmatea
Nomenclature
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Family: LecanoraceaeGenus: Lecidella
SUMMARY
Thallus white to pale grey, often becoming stained green or brown, even black- or rust-red, superficial and continuous, often in orbicular patches, faintly rimose-cracked or granular-verrucose.
Anamorph: no information available.
Teleomorph: ascomata apothecia, to 1.5 mm diam., flat or rarely convex. Thalline exciple absent. True exciple well-developed when young, the edge shiny, blue-black, indigo to green-black, colourless within or with weak turquoise pigmentation, non-crystalline, unchanging in K. Epithecium brown to purple-brown, K+ purple intensifying. Hymenium 60-80 μm tall, not interspersed with crystals or oil droplets. Hypothecium hyaline to pale yellow-brown. Interascal tissue of paraphyses, usually lax (especially in K), unbranched, the apices scarcely swollen, rarely capitate. Asci clavate, Lecanora-type, 8-spored. Ascospores 10-16 × 6-9 μm, ellipsoidal, aseptate, hyaline, fairly thick-walled, smooth, without an epispore, gelatinous sheath or appendages.
Chemistry: thallus C–, K± yellow, Pd–, UV–. Populations have (1) atranorin and zeorin; (2) lichexanthone, norlichexanthone and zeorin; (3) zeorin only.