Slippery Jack & Other Suillus

Slippery Jack - Suillus luteus
Suillus lakei - Matte Jack
Suillus ponderosus - Fat Jack
Suillus ponderosus - Fat Jack
lippery Jack - Suillus luteus



Several species of Suillus are edible when carefully cooked. Slippery Jack is often applied to a few members of Suillus genus. It called "Slippery" because the mushroom's cap is slimy and sticky when moist. The genus name means "swine" in Latin, a term was used to define a type of mushrooms.

Suillus genus is associated with Boletes. The species of both genera often share the same woods, growing under conifer trees; also, they have similar features including convex brown caps and spongy yellowish-brownish pores. Like Boletes, Suillus is one of those that easier to identify.

Until the end of last century, Suillus was a part of the Boletaceae family. However, the molecular taxonomical research, conducted in S. Korea, identified that the Suillus fungi are separated from Boletaceae, and, finally, moved to Suillaceae family.

Currently, one hundred species of Sullius were reported worldwide and 70 in the United States. Several species of Suillus are edible and highly prized in Eastern Europe. Some species of Suillus is bitter or can lead to gastrointestinal upset. Also, diarrhea can occur when the slimy skin of Slippery Jack isn't removed. Rarely, Suillus species can cause an allergic reaction.

It's smart to purchase one or two pocket mushroom guides to cross-reference. Make sure the identification book is up to date and relevant to your area. The good choice is:

National Audubon Society Field Guide to North American Mushrooms
All That the Rain Promises and More: A Hip Pocket Guide to Western Mushrooms

Slippery Jack and other mushrooms of the Suillus genus are widely distributed throughout the Pacific Northwest. These mushrooms grow on the ground under pine and spruce trees. The Suillus mushrooms are considered as one of the low-quality fungi, but not everywhere. These mushrooms are often used in Italian, Polish, and Russian cuisines to prepare delicious meals. It is known as "maslyata" in Russian and "maslaki" in Polish languages that means "Butter Mushroom".

Video



Slippery Jack (Edible)

Slippery Jack - Suillus Luteus

Slippery Jack - Suillus luteus

Slippery Jack (Suillus luteus) is a great wild edible mushroom with a slight aroma and excellent taste. Slippery Jack is good for pickling, preserving, or sautéing. They are not used for drying because of a high water content. The slimy skin should be removed before cooking to avoid gastrointestinal upset (diarrhea).

Cap: Hemispherical to flat. Sticky when moist, yellow-brown to red-brown, 2-5 inches (5-12 cm) wide.
Cap's Underside: Sponge-like, rounded small pores. Whitish to yellow pores, darkening with age, not changing color where bruised.
Spore Print: Elliptical, brown.
Steam: Thick, brown-dotted with a white veil, 1-5 inches (3-12 cm) long.
Flesh: White, becoming yellowish.
Fruiting: In groups.
Habitat: Coniferous forest and lawns, plentiful in pine forests.
Season: September - December.

Similar species are Granulated Slippery Jack (Suillus granulatis) and Short-steamed Slippery Jack (Suillus brevipes) but in these species the veil is absent.




Fat Jack (Edible)

Suillus ponderosus - Fat Jack

Suillus ponderosus - Fat Jack

Fat Jack (Suillus ponderosus), also known as Douglas-fir Suillus is a wild edible mushroom with a great flavor. The mushrooms are abundant on the West Coast and found on the ground in woods or their edges near or under Douglas-fir trees. They are good for pickling, preserving, or sautéing.

Cap: Hemispherical to flat. Sticky when moist, yellowish to brownish, 2-10 inches (5-25 cm) wide.
Cap's Underside: Sponge-like, yellowish when fresh subangular pores, darkening with age, staining brown when bruised.
Spore Print: Elliptical, brownish.
Steam: Solid with veil or partial veil present, yellowish above annulus and orangish-brown not glandular-dotted below annulus, 1-4 inches (3-10 cm) long.
Flesh: Yellowish, staining reddish or brown when bruised.
Fruiting: In groups.
Habitat: Douglas-fir trees.
Season: September - December.

Matte Jack (Edible)

Suillus lakei - Matte Jack

Suillus lakei - Matte Jack

Matte Jack (Suillus lakei), also known as Western Pained Suillus or Lake's Bolete. This wild edible mushroom is characterized by reddish to brownish scales or fibers. The species are common on the West Coast, found on the ground in forests or their edges and associated with Douglas-fir. Matte Jack is good for pickling, preserving, or sautéing.

Cap: Hemispherical to flat. Dry and scaly, reddish to brownish, 2-6 inches (5-15 cm) wide.
Cap's Underside: Sponge-like, yellow to brownish.
Spore Print: Elliptical, brownish.
Steam: Solid, veil or partial veil when young, streaked with with red-brown below the ring, and yellowish above the ring, 1-3 inches (2-7 cm) long.
Flesh: Yellowish, staining blue or blue-green.
Fruiting: In groups or singly.
Habitat: Douglas-fir trees.
Season: September - December.



Methods of Cooking

Methods of cooking: stir-frying, preserving, drying, or freezing. Do not keep Suillus mushrooms for a long time after harvesting. Use young and firm mushrooms. Carefully clean mushrooms. Remove the brown sticky skin off the caps to avoid gastrointestinal upset. If the mushroom is older, remove the spongy part to check for bugs.

Slippery Jack Preserving (1 lb /450 g)

  • Boil the mushrooms for 10-15 minutes in a large amount of water
  • Drain the mushrooms
  • Marinade preparation: 1/2 pint (3oo g) of water, 1 teaspoon of pickling salt, 1/2 teaspoon of sugar, 3 cloves, 5 black pepper, 1 bay leaf
  • Bring marinade to boil
  • Add the mushrooms and simmer all together for 8 minutes
  • At the end of simmering, add 1 tablespoon of 5% vinegar
  • Take the mushrooms from the pot and place them into a jar
  • Pour the marinade to cover mushrooms, chill it
  • Store jars in a refrigerator
  • Drain before serving.

Suillus - Slippery Jack Pickling



Poor Man's Slippery Jack (Inedible)

Suillus tomentosus- Poor Man's Slippery Jack

Suillus tomentosus- Poor Man's Slippery Jack

Poor Man's Slippery Jack (Suillus tomentosus) is also known as Woolly-capped Suillus or Blue-staining Slippery Jack. The mushroom's cap is yellow to orange-brown, fibrous scaly; the spongy layer is yellowish to cinnamon; steam is yellow to orange, thick and may be club-shaped. The fungi are found on the ground in mountain ranges and the coastal forests mostly near or under 2-needle pines. The mushrooms have acidic taste and can cause gastric upset. Besides, Poor Man's Slippery Jack bears a resemblance to other blue-staining species that are poisonous.

Disclaimer: This is not an official guide to wild mushroom foraging. Please do your own research, be sure to practice with a mushroom's expert before you pick up and consume any wild mushrooms.


Young Ju Min, and others Molecular Taxonomical Re-classification of the Genus Suillus Micheli ex S. F. Gray in South Korea Mycobiology. 2014 Sep; 42(3): 221–228.
National Audubon Society Field Guide to North American Mushrooms
All That the Rain Promises and More: A Hip Pocket Guide to Western Mushrooms




Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.