Mushroom Men, sometimes called Fungoids, are a race of intelligent creatures found in subterranean and sylvan environments. Their form is manlike, though most have mushroom-cap heads. Most are gray or yellowish in color, but a variety of colors have been reported.

They begin life as ordinary-looking mushrooms or toadstools, but continue to grow over the course of about a year to a height of about three feet, at which point they transform, gaining limbs and facial features. Young mushroom men (those having 1 hit die) do not yet speak and generally do not fight, though if cornered they will defend themselves. Each year a mushroom man grows roughly six inches, and every second year gains another hit die (so one will have 2 HD at 3 years of age, 3 HD at 5 years, and so on). They learn to speak their own language at the age of 2 and are considered adults at the age of 7 (at which point a mushroom man has 5 hit dice and stands about six feet tall). Mushroom men live short lives, most dying of old age before their seventeenth year (at which point any individual still living stands a full eleven feet tall and has 10 hit dice).

Mushroom men have Darkvision to 120 feet, and move so quietly that they surprise on 1-3 on 1d6. However, they are peace-loving beings who will almost never start a fight, though the older individuals are known to be fierce when they are forced into battle.