Gold Mushroom

Gold Mushrooms are an uncommon type of Mushroom made entirely of gold debuting in New Super Mario Bros. 2. They look similar to both Golden Dash Mushrooms from the Mario Kart series and Golden Mushrooms from Mario & Luigi: Superstar Saga, though unlike them, Gold Mushrooms have light caps with dark spots.

New Super Mario Bros. 2
Gold Mushrooms appear in New Super Mario Bros. 2 in the Coin Rush mode, where they replace 1-Up Mushrooms. Upon contact, Mario gets 50 coins (or 100 coins if he is Gold Mario).

Captain Toad: Treasure Tracker
Gold Mushrooms appear as rare collectibles in some courses in Captain Toad: Treasure Tracker and its Nintendo Switch and Nintendo 3DS ports, acting as they do in New Super Mario Bros. 2. These mushrooms are usually a secondary objective in the courses they appear in. Some Gold Mushrooms can only be found through invisible Pluck Patches, which can be seen once Captain Toad approaches or reveals them with his headlamp.

Puzzle & Dragons: Super Mario Bros. Edition
Gold Mushrooms are rare items in Puzzle & Dragons: Super Mario Bros. Edition. They are obtained from ? Blocks or dropped after defeating some enemies with a 10+ combo, such as 2-Goomba Towers and Paragoombas. There is an even rarer variation called Grand Gold Mushroom. It raises the Skill levels of all Toad colors, and all types/forms of Goombas and Piranha Plants from Level 1-4.

New Super Mario Bros. 2

 * North American website bio: "This valuable fungus only appears in orange. But if you manage to find one, you'll get 50 coins on the spot."