[2] It was first described scientifically by American mycologists Alexander H. Smith and Harry D. Thiers in 1964.

[3] It can be found growing with Douglas fir trees.

[2] S. caerulescens S. lakei S. granulatus S. grevillei S. luteus S. brevipes S. cavipes all other Suillus species The cap is yellowish to reddish brown, sometimes with streaks from its darker center.

[4] It ranges from 5–15 cm (2–6 in) in diameter, shaped convex to flat, and viscid when wet,[6] sometimes with veil remnants on the edge.

[4] The stalk is yellowish to brown, darkening with age, 2–8 cm tall and 1–3 cm wide, and bruises bluish at the base;[6] it sometimes has a faint ring.