Alyxoria subelevata

Thallus thin or rather thick or immersed, smooth to finely rimose-cracked and ± granular, ash- to yellow-grey. Apothecia 0.5–1.5 (–2.5) × 0.12–0.3 (–0.4) mm, scattered or crowded and contiguous, elongate, sessile, elevated, occasionally furcate, ends often acute; disc usually well exposed, densely bluish mauve-grey pruinose; exciple thin, even, non-pruinose, K–; epithecium brown; hymenium 80–90 (–100) μm tall. Ascospores (16–) 20–23 (–27) × (5–) 6–7 (–8) μm, 3-septate, ± elongate-clavate, sometimes becoming brownish when old. Conidia 4–6 × 0.7–1 μm, bacilliform or slightly curved. Thallus C–, K–, KC–, Pd–, UV– (no lichen products detected by TLC).

The prominent apothecia with ± open, grey-blue pruinose discs with black, naked margins are distinctive. Distinguished from Opegrapha demutata by the larger apothecia, shorter conidia and larger ascospores.