あやしいキノコ [ayashii kinoko] or 'suspicious mushroom' in Japanese.
Final Fantasy XIII-2
Use: decorate your monster
Equip: ?
Obtain: use Improved Moogle Throw in Yaschas Massif (1X AF)
Description: ?
Lightning Returns
Buy: -
Obtain: reward for A Final Cure
Type: Adornment
Grimoire of the Rift

Buy: - (sell: 800 gil)
Use: Ashura, Harpe, Target Bow
Treasure: Now That's a Fire! (once), Plea for Help x2 (once)
Type: Flora, Rank: ★★
Description: This mushroom looks like trouble. None yet have been fool enough to test it and see if it actually is poisonous.
Other: as 'Suspect Mushroom'
Final Fantasy Tactics S

Buy: - (sell: 200 gil)
Use: Magickal Rod, Rod
Obtain: Mechanic City Mogpeno/Mushroom Woodsea lv30+
Description: An uncommon plant
Category: Item