Poison Mushroom

A Poison Mushroom (or Poison Shroom) is a Mushroom that kills Mario or Luigi if they touch it. Poison Mushrooms appear in Super Mario: The Lost Levels or the For Super Players Levels in Super Mario Bros. Deluxe. The design changes each game from a purple top with the skull to a plain all-green Mushroom. Poison Mushrooms are used by Princess Peach and Toad as weapons in Super Mario Kart. When touching it, the player will shrink for a few seconds, similar to the effect of a Thunderbolt.

In Mario Party, when landing on a Mushroom space, if chosen the Poison Mushroom, he/she will lose his/her next turn.

In Mario Party 3, the Poison Mushroom is an item that the players can use on either themselves or one of their opponents. A player who is cursed by a Poison Mushroom can only roll the numbers 1-3 on their next turn. It is possible to elimate the curse by using another Mushroom or a Magic Lamp. It is Waluigi's favorite item.

In Luigi's Mansion there are Poison Mushrooms that bosses throw when Luigi tries to suck them up. They make Luigi small and lose pearls and coins, also making them escape as Luigi is too tiny to suck up anything bigger than a lost pearl. Also, if Luigi calls for Mario by pressing the A button, his voice can barely be heard.

In Mario & Luigi: Superstar Saga, Mario ingested a Poison Mushroom that was dark green with dark red spots in Little Fungitown. The mushroom made Mario extremely ill, forcing Luigi to journey to Guffawha Ruins to find the only known cure, Crabbie Grass. That was actually a mix of Starmen and Mushrooms, called the Invincishroom. Also, one of the things Trunkle can suck in his mouth during the "Envelop and Heal" move is a Poison Shroom. They are colored the same, and Poison a brother if touched. Popple sometimes throws them during his, "Throw from the Bag" move. They are also the same, but the poison they give a brother if touched is more severe.

Darker red Poison Mushrooms were later seen in Super Smash Bros. Melee, in which it temporarily shrinks characters down to one-fourth their original size. That makes the player smaller, but also makes him/her easier to KO.

The Poison Mushroom's effects in Super Smash Bros. Brawl are slightly different. Not only does the fighter become smaller and lighter, but his/her attack power drops greatly as well. An attack with strong knockback would pack less power than normal when the fighter is tiny.

The mushroom was seen once again in Paper Mario: The Thousand-Year Door. Poison Mushrooms could be created by Zess T. by mixing a Slow Shroom and Inky Sauce or Trial Stew and a Dried Bouquet. If Mario or his partner eat this mushroom, the user will lose half his HP and be poisoned. However, in battle, if a character has the Feeling Fine (P) badge equipped when using a Poison Mushroom, there's a chance the user's HP will go to max. They're one of the pictures that the player can earn when in battle. If three in a row appear Mario's HP, FP and SP will all be cut in half and all of the audience members will leave.

In Super Paper Mario, Poison Mushrooms are a much more common occurance than in its prequel, occasionally being dropped by Zombie Shrooms and their relatives. They are used slightly more in recipes; for example, a single Poison Shroom can produce a Dangerous Delight.

Although not technically Poison Mushrooms, items called Cursed Mushrooms appear throughout the Mario Party series and are clearly based on Poison Mushroom.

Trivia
A different kind of mushroom similar to the shrinking kind of Poison Mushrooms is called the Mini Mushroom.

The Poison Shrooms on the Paper Mario: The Thousand Year Door's slots have faces, but the Poison Shroom item doesn't.