Butyriboletus appendiculatus is an edible pored mushroom that grows under oaks and other broad leaved trees such as beech.

The species was first described scientifically by German polymath Jacob Christian Schäffer in 1774 as Boletus appendiculatus.

[1] American Charles Horton Peck later used the name in 1896 for a species he found in Washington,[2] but the name was illegitimate because Schäffer's earlier usage has priority.

[6] The bolete is edible and considered choice by several sources, although some warn that certain individuals may have an allergic reaction to it.

In North America, it is more common in the Pacific Northwest region, where it often associates with live oak and tanoak.