Alyxoria mougeotii  

Thallus thin, often immersed, smooth, scurfy or finely rimose-cracked, cream-white, buff, rarely pale green or ochraceous. Isidia and soralia absent. Photobiont Trentepohlia.
Anamorph: conidiomata pycnidia. Conidia of two types, bacilliform and 5-8 × 0.7-1 µm in size and ellipsoidal, 3-5 × ca 1.5 µm in size.
Teleomorph: ascomata apothecia, lirellate, 0.6-1.5 (-2) × 0.3-0.5 mm, 150-220 µm tall, scattered or contiguous, usually sessile and simple, straight or curved, the ends acute. Disc initially a slit, soon becoming widely exposed. Exciple K–, sometimes yellow-green or grey-blue pruinose. Epithecium brown, K–.  Hymenium 70-110 µm tall, I+ red. Hamathecium of pseudoparaphyses, septate, branched, often richly anastomosed, apices not or rarely slightly swollen. Asci clavate-cylindrical, fissitunicate, 8-spored. Ascospores (20-) 25-33 (-55) × 5-8 (-10) µm, 5- to 7- (to 8-) septate, usually with an enlarged middle cell, with a thin epispore.
Chemistry: thallus C–, K–, KC–, Pd–, UV– (no lichen products detected by TLC).