The mushroom stem, stalk or stipe & the cap.
The stem may be long or short, thick or thin, solid or hollow.
It may be cylindrical or swollen at the top, centre or base.
It is often white but can be shades of orange, brown or yellow.
The surface may be smooth, grooved or ridged.
There may be coloured fibrils or a reticular network on part or all of it.
If there is a ring it may be single or double, rigid or drooping, wide or narrow
and variously coloured.