Opegrapha cesareensis  

Thallus thin, even and smooth, sometimes rimose-cracked, rarely inconspicuous, effuse or delimited, almost white to pale lilac-brown or grey-lilac, often forming extensive mosaics, a thin grey-black prothallus often visible at the periphery. Chemistry C–, K–, KC–, Pd–, UV– (no lichen products detected by tlc).

Anamorph: conidia 6-7.5 × 0.7-1 μm, bacilliform, straight.

Teleomorph: ascomata apothecia, lirellate, 0.3-1(-2) × 0.15-0.3(-0.45) mm, 0.2-0.6 mm high, scattered, infrequently branched, rarely contiguous, sessile, straight or curved, prominent, sometimes elevated on a small thalline cushion; disc a persistent slit Outer wall thick, somewhat swollen, K± dull green; epithecium brown; hymenium 80-90 μm tall, J+ blue in upper part. Ascospores (13-)15-22(-26) × 4-5 μm, (3-)4- to 5(-6)-septate, the cells elongate, ± equal in size.