How to identify it?
Cap
Cap 4-12 cm across, conical, later flattening out; chestnut, rusty, olive brown, or dark brown; surface slimy, shiny when dry.
Flesh
Flesh soft, white to lemon-yellow. Taste pleasant.

Scientific Classification

Phylum
Club fungi Class
Mushroom-forming fungi Order
Boletes and allies Family
Suillaceae Genus
Slippery jacks Species
Slippery jack