Gracilis means slender, referring to the stem.
The pileus is one to two inches broad, convex, smooth or minutely tomentose, the epidermis frequently cracked as in the illustration; ochraceous-brown, tawny, or reddish brown; flesh white.
The tube surface is convex to plane, depressed around the stem, nearly free, whitish, becoming flesh-colored.
The stem is long and slender, equal or slightly tapering upward, usually curved; pruinose or mealy. The spores are subferruginous, .0005 to .0007 inch long, .0002 to .00025 inch broad.
This is quite a pretty plant, but at first sight it will not be taken for a Boletus. They are not plentiful in our woods. I find them only occasionally and then sparsely. They are found in July and August, the months for the Boleti. They grow in leaf mold in mixed woods, especially among beech timber.
Boletus striæpes. Secr.
Striæpes means striate stem.
The pileus is convex or plane, soft, silky, olivaceous, the cuticle rust-color within, flesh white, yellow next the tubes, sparingly changing to blue.
The tubes are adnate, greenish, their mouths minute, angular, yellow.
The stem is firm, curved, marked with brownish-black striations, yellow, and brownish-rufescent at the base.