Anamorph: Nodulisporium sp. Conidiophores in culture brownish, conspicuously verrucose, 2-4 µm diam., prostrate to erect, unbranched or with one to three branches initiated at nearly the same or at different levels. Conidia produced mostly at apices of branches, often forming false heads owing to large numbers of conidia arising from a limited conidiogenous area. Conidiogenous cells proliferating sympodially with rhexolytic secession. Conidia 4.5-8 x 2-3 µm, obovoid to ellipsoidal, sometimes irregular, rounded at the apices, hyaline, smooth, with flat basal scars corresponding to the secession points.
Teleomorph: stromata (5-) 8-12 (-15) mm diam. and 3-6 mm thick, pulvinate to ± peltate, circular or elliptical in outline, sometimes formed in lines along bark crevices, the surface dark brick red to blackish. Pigments in KOH vinaceous red. Perithecial contours relatively inconspicuous. Ascomata perithecia, 400-500 μm diam. and 500-750 μm high, spherical to ellipsoidal, the ostioles papillate, without a surrounding disc. Asci 130-160 μm × 4.5-5.5 μm, cylindrical with a long tapering stalk, fairly thick-walled but not fissitunicate, the apex obtuse, with an apical ring ca 1.5 μm high and 2-2.5 μm broad that does not blue in iodine, 8-spored. Ascospores 7-8.5 × 4-4.5 μm, light brown to brown, ellipsoidal, noticeably inequilateral, with a perispore dehiscing in 10% KOH, and an inconspicous germ slit running most of the length of the wall opposite the flattened side, without a gelatinous sheath or appendages.
Not formally assessed; the species is fairly common especially in the west and unlikely to be threatened.
On rotten bark of Quercus petraea and Q. robur.
South and west England, Wales and western Ireland.