Basidiome: annual, fully resupinate, tightly attached to substrate, from a few centimetres to over 1 square metre in size. The hymenial surface is densely covered with downward pointing spines, 5-17 mm long and up to 1 mm in diameter. Sulphur yellow at first then discolouring wine-red, ocher-brown to rust-brown. Flesh: up to 30 mm thick, yellow, granular, waxlike consistency. Odour: strong and distinctive, sweetish fruity, resembling pineapple, anise or amyl alcohol. Hyphal system: monomitic, subhymenial hyphae thin-walled, subicular hyphae thick walled, 2.5-5.0 μm wide, septa with clamps. Sclerocysts in the trama. Basidia: clavate, some constricted, 20-35 x 4-6 μm, with basal clamps. Spores: subglobose, drop shaped, smooth, hyaline, with thickened walls, with oil drops, 4.5-6.5 x 3.5-4 μm, some cyanophilic (stained strongly by cotton blue).
Found on damaged places of living trees commonly in knotholes, hollow trunks or rotten places under the bark, of Malus (apple) and occasionally other fruit trees. The host trees are mainly found in old orchards and domestic gardens.