Anamorph: conidia catenulate, hyaline, individual cells 3–5 × 2–3.5 μm. Teleomorph: basidiomata 0.2–3 mm diam., extremely variable in form, size and colour, generally ± spherical and convex with a constricted base, often with lobate margins, sometimes flattened or with a concave central part, rarely effuse and covering larger areas around the branches of the host, smooth or rarely tuberculate, cartilaginous, pale pinkish, reddish brown, dark brown or black. Context hyphae 2–3 μm diam., mostly uniform, walls not markedly thickened, clamps not observed. Haustorial branches frequent, mother cell 2.5–5 μm diam., subspherical or sometimes elongate, haustorial filament 0.5 –1 μm thick, to 11 μm long. Hymenium containing numerous probasidia, developing from a basal clamp that is not observed in mature basidia. Basidia, 20– 44 × 3-6.5 μm, clavate to ± cylindrical, with 3 transverse septa, epibasidia 2-3 μm thick, to 85 μm long. Basidiospores 4.5– 8 × 4 –7.5 μm, subglobose to ellipsoidal, with a distinct apiculus.