Dick & Snell) Vassilkov 1966 Boletus separans var.

The cap is up to 18 cm wide, convex to flat, and brown in color.

The stem is brown like the cap and has a light-colored reticulate texture.

[1][2] The specific epithet is from Latin: sub- + caeruleus + -escens, literally "becoming dark blue beneath".

Phylogenetic analysis has shown B. subcaerulescens as a member of a clade, or closely related group, with B. pinophilus, B. regineus, B. rex-veris, B. fibrillosus, and Gastroboletus subalpinus.