 Suillus americanus is a species of fungus in the Suillaceae family of mushrooms . Commonly known as the chicken fat mushroom , the American slippery Jack ( or slipperycap ) , or the American suillus , it grows in a mycorrhizal association with eastern white pine and can be found where this tree occurs in eastern North America and China . The mushroom can be recognized by the bright yellow cap with red to reddish @-@ brown scales embedded in slime , the large yellow angular pores on the underside of the cap , and the narrow yellow stem marked with dark reddish dots . Molecular phylogenetics analysis suggests that S. americanus may be the same species as S. sibiricus , found in western North America and western and central Asia . Suillus americanus is edible , although opinions vary as to its palatability ; some susceptible individuals may suffer a contact dermatitis after touching the fruit bodies . The fruit bodies contain a beta glucan carbohydrate shown in laboratory tests to have anti @-@ inflammatory properties . 
