Lecanora mughicola

Thallus wide-spreading, uneven, continuous, ± rimose-cracked, whitish-grey or yellowish-grey to grey or fawn-grey to dark brown, rarely with a green hue, the surface matt or shiny and appearing waxy, or sometimes endophloedal, not sorediate. Apothecia numerous, scattered or more often becoming contiguous, occasionally fused, evenly rounded at first, becoming irregularly rounded to somewhat angular, innate but becoming sessile, 0.4–0.7 mm diam., thalline margin concolorous with the thallus, thick, raised and smooth to subrugose in young apothecia, becoming uneven and level with the disc when older, at times almost nodular, persistent; disc rarely concave at first, generally flat, becoming weakly convex, minutely roughened, matt, brown to jet black, less frequently pale ochre to light brown, red-brown or dark blue-grey; hymenium 50–65 μm tall, colourless; epithecium brown to dark olive-brown, with a layer of golden-brown granules above that dissolve in KOH. Ascospores 12–14 × 4.5–5.5 μm, wall ca 1 μm thick. Conidia of three types: microconidia [rare], 6–9 × 0.8–1 μm, bacilliform to slightly curved; leptoconidia [frequent], 16–20 × 0.8– 1 μm, strongly curved; mesoconidia [rare] 3.5–4 × 1.5–2 μm, bacilliform. Thallus C–, K–, KC–, Pd–, UV– (isousnic acid).

A member of the Lecanora saligna group. Similar to the widespread L. pulicaris which is K+ yellow and Pd+ orange- red and has a whitish thallus.