Thallus: smooth, continuous, not well delimited; immersed in the substratum, composed of colourless to pale brown smooth thin-walled hyphae ca 4 µm diam, associated with trentepohlioid algae with filaments 8.5-15.5 µm diam.
Anamorph: reported in the literature, but not seen in GB&I material.
Teleomorph: ascomata 140-200 µm diam, blackish, shiny, smooth, usually confluent in groups of 3-5, circular, not surrounded by a basal fringe; at first immersed in the substratum, becoming half immersed to superficial, hemispherical, ca 85 µm high, dimidiate; the ostiole centrally located in a small depression. Involucrellum reddish-brown to black, ca 20-30 µm thick, not extending beyond the ascomata, consisting of bark cells intermixed with reddish to dark brown, nearly black, thin-walled smooth isodiametric cells 3-4.5 µm diam. Exciple intergrading with the involucrellum, colourless to pale brown, 7.5-12 µm thick, consisting of smooth thin-walled isodiametric cells, forming a textura globulosa-angularis. Interascal tissue of pseudoparaphyses 1.5-2 µm diam, staining bluish-green in iodine. Asci 50-60 x 9-14 µm, cylindric-clavate, short-stalked, fissitunicate, the apex of the inner wall truncate to slightly pointed, 8-spored. Ascospores fasciculate in the ascus, 15-20 (-25) x 1.5-2 µm, colourless, 0- or 1-septate, fusiform, attenuated at the apices, without a gelatinous sheath or appendages.