High Quality Content by WIKIPEDIA articles! Boletus amygdalinus is a fungus of the bolete family found in western North America. The fruit bodies, or mushrooms, are characterized by their thick, red to brown caps, red pores, and the strong bluing reaction observed when the mushroom tissue is injured or cut. The cap can reach diameters of up to 10 cm (3.9 in) and the stem 9 cm (3.5 in) long by 3 cm (1.2 in) thick at maturity. This mushroom has been found in manzanita and madrone woodlands of central California north to southern Oregon. Although the edibility of the mushroom is not known with certainty, it may be poisonous, and is not recommended for consumption. Other similar red-pored, bluing boletes from North America, including B. eastwoodiae, B. luridiformis, and B. subvelutipes, can be distinguished from B. amygdalinus either by the color of the cap, the degree of reticulation on the stem (a network of raised ridges), or by location.