Tylopilus rufonigricans is a bolete fungus in the family Boletaceae found in the Pakaraima Mountains of Guyana.

The cap surface is covered with black scales, while the surface between the scales is initially greenish yellow, and later dull green and eventually greyish black.

The stipe measures 6–10 cm (2.4–3.9 in) long by 10–20 mm thick.

T. exiguus fruits singly on root mats on trunks of Dicymbe corymbosa.

The specific epithet rufonigricans refers to the reddening reaction of the flesh upon injury.