The Slippery Jack (Suillus Luteus) is found in coniferous woods in summer to late autumn. Their slippery, rather snotty, cuticles make them very distinct from other mushrooms. One closely related species is the Larch Bolete (Suillus Grevillei) which is paler and more yellow in colouration and as the name suggests, grows exclusively under larch trees.
The slimy caps dry out very quickly and become quite tacky. It is often a good idea to peel the cap skin off as soon as possible after picking. They lack a distinct flavour and only freeze well when cooked so these beauties are best eaten fresh in soups and stews, or added to mushroom mixtures for bulk