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Family: LecanoraceaeGenus: Myriolecis
Thallus within the substratum, immersed and not apparent, mostly endolithic, or superficial but indistinct, very thin, ecorticate, or composed of inconspicuous granules (distinct coarse granules sometimes observed are usually those producing apothecia); pale grey, yellowish or whitish.
Anamorph: not known.
Teleomorph: ascomata apothecia, 0.3–0.9 mm diam., occurring singly or clustered in groups, sessile or constricted at the base, concave, flat when mature or soon convex. Disc plane, smooth, yellowish grey, pale brown, dark brown or almost black, sometimes greenish when wet, epruinose or rarely slightly pruinose. Margin prominent, smooth, even or slightly flexuose, uniform, often pruinose especially on calcareous substrata, white. Epithecium yellow or brown, granular (pol+), the granules superficial and between paraphysis tips, or also inspersed in the hymenium and hypothecium, sometimes with an epipsamma (insoluble in K and soluble in N). Hymenium 45–70 μm high, hyaline, or pale yellow. Hypothecium hyaline or almost so, 40–120 μm high, composed of adglutinated hyphae to apparently cellular, often with some granules. Interascal tissue of slender paraphyses, somewhat branched throughout, rarely anastomosing, not expanded and usually not pigmented, coherent in K. Asci clavate, 8-spored. Ascospores 8–12 × 4.5–6 μm, L/B ratio = 1.5–2.7:1, ellipsoidal, hyaline, aseptate.
Chemistry: apothecial margin K–, C–, KC–, PD– or PD+ orange; disc K–, C–, KC–, PD–; apothecia UV-negative or ± pale yellow or dull greenish.