Suillus luteus (Fr.) S. F. Gray syn. Boletus luteus Fr. Butterpilz Bolet Jaune, Nonnette voilée, Bolet annulaire, Slippery Jack. Cap 5–10cm, chestnut to sepia covered in brown gluten, becoming more rust-coloured with age, shiny on drying. Stem 50–100 x 20–30mm, pale straw-coloured at apex rapidly discoloured with darkening glandular dots, with a large white to cream ring which darkens to sepia, white below becoming vinaceous brown with age. Flesh white, often vinaceous at base of stem. Taste and smell not distinctive. Tubes lemon-yellow to straw-colour. Pores round, similarly coloured, becoming flushed sienna. Spore print clay to ochraceous. Spores subfusiform to elongate ellipsoid, 7–10 x 3–3.5um. Habitat with conifers, usually Scots pine. Season autumn. Common. Edible. Distribution, America and Europe.