~ Cap whitish, maturing to dingy buff. (1/2)
~ Cap more highly colored. (2/2)
* Ammonia on cap surface producing a green to blue-green reaction. (1/2)
* Cap 3-11.5 cm, reddish to purplish; pore surface bruising brownish; stem brownish; spores 8-14 x 3-4 µ. (1/2)
Xanthoconium purpureum
* Cap 6-20 cm, variable in color but with lilac brown shades when young; pore surface not bruising; stem whitish with areas flushed with the cap color; spores 12-16 x 3.5-5 µ. (2/2)
Boletus separans
* Cap surface reaction to ammonia not green or blue. (2/2)
* Growing under hardwoods or conifers; young cap dark brown to yellow-brown; spores 12-16 x 3-4 µ; widely distributed east of the Great Plains. (1/3)
Xanthoconium affine
* Growing under hardwoods; young cap golden brown; spores 10-12 x 2.5-3.5 µ; known from North Carolina. (2/2)
Xanthoconium chattoogaensis
* Growing under birch and hemlock; young cap whitish; spores 10-13 x 3-4.5 µ; known from Pennsylvania. (3/3)
Xanthoconium montaltoense