Suillus grevillei

[2] Suillus grevillei is a mushroom with a 5–10 cm (2–4 in) cap colored from citrus yellow to burnt orange,[3] that is at first hemispherical, then bell-shaped, and finally flattened.

It has a sticky skin, often with veil remnants on the edge,[4] short tubes of yellow (possibly staining brownish)[4] which descend down to the bottom of its cylindrical stalk (6–10 x 1–2 cm), which is yellowish above the ring area with streaks of reddish brown below.

[5] Suillus grevillei can be cooked as an edible mushroom (without consistency nor flavor) if the slimy cuticle is removed off the cap.

[6][3] This mucousy skin layer is what is known to cause intestinal issues, as is the case with several other Suillus such as Slippery Jack (S. luteus) or Jill (S. salmonicolor); often considered to be not worth the work.

The estimated gene density based on the cosmid library is 1 per 3900 bp of genomic DNA.