High Quality Content by WIKIPEDIA articles! 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.