Pulveroboletus acaulis Buchwaldoboletus acaulis is a species of bolete fungus in the family Boletaceae native to Lesser Antilles and Martinique.

Found on wood in xero-mesophytic forests, it has a convex bright yellow cap, sulfur-yellow pores and stipe, and a brown spore print.

Originally described by David Pegler in 1983 as Pulveroboletus acaulis, it was given its current name by Ernst Both and Beatriz Ortiz-Santana in A preliminary survey of the genus Buchwaldoboletus, published in "Bulletin of the Buffalo Society of Natural Sciences" in 2011.

[1] The cap is bright yellow, convex, and measures 3–6.4 cm (1.2–2.5 in) in diameter.

The stipe is rudimentary, lateral to very excentric, same color as the cap.