The slippery jack: a pine-associated bolete with a slimy chestnut- to dark-brown cap, yellow pores and a membranous ring that is violet-brown beneath. Native to Eurasia, it has been spread with pine plantations to many parts of the world.
Edible but less highly regarded than other boletes. Remove the slimy cuticle (and ideally the tubes) and cook before eating; the slime can cause indigestion, and some people have allergic or digestive reactions to this and other Suillus species.
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Habitat
Coniferous forests in its native range and pine plantations where naturalized; ectomycorrhizal with pines, including Scots, black and Macedonian pine in Europe, red and white pine in North America, and Monterey and lodgepole pine where introduced.
Distribution
Native to Eurasia, from Ireland to Korea. Introduced with pines to North and South America, southern Africa, Australia and New Zealand.
Characteristics
Cap: 4–10 cm (rarely to 20 cm) wide, conical becoming flat; chestnut, rusty, olive-brown or dark brown; slimy and glossy, with an easily peeled cuticle. Pores: Tiny and round (about 3 per mm when young, 1–2 per mm at maturity), yellow becoming olive to dark yellow; tubes 3–7 mm deep. Stem: 5–10 cm tall, 2–3 cm wide, pale yellow with glandular dots above the ring, dingy white below. Ring: Membranous, persistent, whitish above and dark brown to violet beneath; gelatinous in humid weather. Spore print: Ochre to clay. Spores: 7–10 × 3–3.5 µm, elongated elliptical.
