Ramonia nigra  

Thallus inconspicuous, almost completely immersed in the substratum. Photobiont Trentepohlia.
Anamorph: not known.
Teleomorph: ascomata apothecia, 0.4-0.6 mm diam., scattered or more rarely ± confluent in small groups, at first partially immersed with a minute pore, becoming erumpent with the pore expanding to ca 0.3 mm diam., black but often appearing white-pruinose or almost striate due to adhering bark cells, disc pale grey. Exciple with a dark brown outer layer 12-15 (-20) µm thick and a broad inner ± colourless layer, the inner surface lined with a palisade of periphyses 5-10 x 2-2.5 um in size; subhymenial layer pale brown. Hymenium 120-160 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 120-140 x 14-17 µm, ± cylindrical or slightly tapered towards the apex, short-stalked, fairly thin-walled and not fissitunicate, the apex rounded, with an amyloid ring structure, (4- to) 8-spored. Ascospores 28-45 (-50) x 8-13 µm, cylindric-ellipsoidal to ellipsoidal, thin-walled, ± colourless, muriform.

Description adapted from Coppins (1987).