 The stem surface is red or yellowish with red lines, often white or yellow at the base, and solid (that is, not hollow), with fibrous flesh; in maturity the stem ages to yellowish-red to dark red.The spore print is olive-brown; one source notes that creating a spore print may result in "a lot of yellow juice on the paper".The spores are ellipsoid in shape, smooth, and have dimensions of 12–16 by 4–6 µm, although occasionally there will be some "giant spores" with lengths of up to 24 µm.