Cortinarius (Phlegmacium) elegantissimus Rob. Henry syn. C. aurantioturbinatus J.E. Lange (illustrated 40% life size) Cap 4.5–12cm across, convex then expanded, margin incurved; sulphur-yellow, soon discolouring rusty, especially towards the centre, remaining sulphur-yellow at the margin; cuticle reddish-brown to purplish-black with NaOH. Stem 60–120×10–18mm, 20–40mm wide at more or less marginate bulb; yellow, becoming tinged buff. Flesh white, sulphur-yellow in bulb; taste mild, smell sickly sweet. No reaction with NaOH. Gills adnate to free; yellow then olivaceous, finally pale rust. Spores 11.5–15×7–8.5¼, lemon-shaped, very rough. Spore print rust. Habitat in beech woods on chalk; autumn. Rare, vulnerable on Red Data List. Suspect avoid.