Stipe
The stipe of the brown birch bolete is thin, white or yellowish-brown, and from 3/8 to 1 3/8 inch in diameter. It has dense whitish flesh at a young age and spongy, more loose, and moist flesh at an old age. The stipes of young mushrooms are barrel-shaped, older mushrooms have thin and elongated stipes, slightly tapering upward. The surface is covered with dark brown scales, which are coarser in the lower part of the stipe.

Young orange oak boletes often have barrel-shaped stipes, which become thicker at the apex than the base with age — tapering toward the cap. The stipe is 3/4—1 1/4 inch thick, but in some cases it can be a little thinner or thicker. The entire surface of the stipe is covered with brownish, woolly scales, which are denser in the lower part of the stipe. As the mushrooms age, the scales become darker.
Color of the stipe flesh
When cut, the stipe of the brown birch bolete remains white or turns pinkish, but never turns blue.

In contrast, when the flesh of the cap and stipe of the orange oak bolete is cut, it becomes dark and slightly blue.
Habitat
The brown birch bolete is an ectomycorrhizal fungus and grows in a mutually beneficial relationship with birch trees.

The orange oak bolete is also an ectomycorrhizal fungus. Most often, it grows under aspens, poplars, and sometimes — under oaks, beeches, and birches.

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