Mushroom

Mushrooms are a common item found in just about every Mario game invented. Different types of mushrooms have different effects. Even the Toad people are humanoid mushrooms. A list of different kinds of mushrooms and how to identify them is as follows:
 * 1-Up Mushroom (Green cap)
 * Golden Mushroom (Golden)
 * Invincishroom (Green cap with purple spots)
 * Max Mushroom
 * Mega Mushroom (Light Green cap or Yellow cap with red spots)
 * Mini Mushroom (Pink cap or Sky blue cap)
 * Poison Mushroom (Various)
 * Reverse Mushroom (Green cap with red arrow)
 * Super Mushroom (Red cap)
 * Volt Shroom (Yellow cap or Black cap with yellow lightning bolts)
 * Super Shroom (Blue cap)
 * Ultra Shroom (Green cap)
 * Life Shroom (Pink cap sometimes with heart)
 * Dried Shroom (skinny)

In Super Mario RPG: Legend of the Seven Stars, a basic Mushroom recovers 30 HP for one party member. This mushroom had a red and white cap with an orange stem (and no face). However, Mushrooms that are found in Treasure Boxes recovers all HP and FP for Mario's entire party. These Mushrooms are used as soon as they are picked up. Additionally, these powerful Mushrooms have faces. In the same game, becoming a Mushroom is status ailment. While a Mushroom, the character recovers health every turn, but is completely immobilized.

During the events of Mario & Luigi: Superstar Saga, a Mushroom recovers twenty-five HP for one ally. In Mario & Luigi: Partners in Time, a Mushroom recovers twenty HP for one ally.

Trivia
In Mario & Luigi: Superstar Saga, it is interesting to note that the Mushrooms had no faces, and their cap's coloring was reversed. They had red spots on a white cap, making the Mushrooms look much like Toad.