Boletus coniferarum Caloboletus conifericola, commonly known as the dark bitter bolete,[1] is a species of mushroom in the family Boletaceae.

[1][3] The cap of Caloboletus conifericola is grayish-brown to olive gray[4] and about 3-10 inches (7-25 cm) across.

[1] The pore surface is yellow, and the mushroom oxidizes blue when bruised.

Caloboletus calopus has a more reticulated stipe than C. conifericola,[2] and C. frustulosus has a more cracked cap.

[4][2] Caloboletus conifericola is found in moss and leaf litter under conifer trees, especially grand fir and western hemlock.