Cortinarius (Phlegmacium) percomis Fr. (illustrated 45% life size) Cap 4–8cm across, margin inrolled when young; strong bright yellow to greenish-yellow; viscid when wet. Stem 40–80×10–18mm, base swollen or with slight marginate bulb; yellow, veil yellow. Flesh pale yellow; smell distinctive, strong, sweet. Gills adnate; yellow at first, becoming more rusty with age. Spores 9–10.5×3.5–5.5¼, lemon-shaped, rough. Spore print rusty brown. Habitat in mixed woods, usually on calcareous soils; autumn. Very rare, vulnerable on Red Data List. Not edible.