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).