Miriquidica subplumbea  

Thallus lead grey to dark grey, matt, areolate, usually rather thick, to several cm diam. Areoles to 1.5 mm diam., dense, verrucose, not or somewhat subdivided, plane to slightly convex. Hypothallus usually indistinct.
Anamorph: not known.
Teleomorph: ascomata apothecia, often not very numerous, black, 500-1200 µm diam., laterally attached to areoles, subsessile, plane and marginate when young, later convex and virtually lacking a margin. Excipulum externally blue-green to olive-brown, internally brownish to almost hyaline. Hypothecium hyaline. Hymenium hyaline, 55–65 µm high, the upper 10–15 µm olive-green to greenish brown forming an epihymenial layer. Interascal tissue of paraphyses, mostly unbranched, 55–65 µm long and 1.5–2.0 µm diam., the apical cells hardly or slightly enlarged to 4 µm diam. Asci of Lecanora type, 40–50 x 14–18 µm, the outer wall layer and tholus except the central body I(Lugol)+ blue, 8-spored. Ascospores 10–13 x 5–6(–7) µm, length/breadth ratio 2.0–2.3, ellipsoid, hyaline, aseptate.

Chemistry: Cortex K–, P–, C– , medulla K–, P–, C–, containing miriquidic acid.