Thallus inconspicuous, almost completely immersed in the substratum. Photobiont Trentepohlia.
Anamorph: not known.
Teleomorph: ascomata apothecia, 0.5-0.7 mm diam., scattered or more rarely ± confluent in small groups, at first partially immersed with a minute pore, becoming erumpent with the pore widening to ca 0.4 mm diam., almost white to cream-brown, disc white to pale grey. Exciple with a pale outer layer 12-15 (-20) µm thick of angular cells and a broad inner ± colourless layer, the inner surface lined with a palisade of periphyses 6-9 x 2-2.5 um in size; subhymenial layer pale brown. Hymenium 95-120 µm tall, colourless, I+ pale blue. Interascal tissue of copious narrow paraphyses ca 1 µm diam., the apices conglutinate and slightly thickened to ca 2 µm diam. Asci 85-105 x 14-18 µm, ± cylindrical or slightly tapered towards the apex, short-stalked, fairly thin-walled and not fissitunicate, the apex rounded, with a minute amyloid ring structure, (2- to) 8-spored. Ascospores 22-39 x 7-12 µm, the size dependent on the number of spores in the ascus, cylindric-fusiform to ellipsoidal, thin-walled, ± colourless, muriform, without a perispore or gelatinous appendages.
Description adapted in part from Coppins (1987).
S. England, Wales, Scotland; very scattered in distribution.
On bark of broadleaved trees and rotten wood inside hollow trunks.