The same reason luigi doesn't tell rosalina that the npc luigi found it Mario just wants the credit for collecting it
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Luigi is not in Super Mario 64. But he would likely just be Mario with a green shirt, green hat, and an L on his hat.
Because red and green are common colors
get a green mushroom
The green mushroom on the Super Mario Bros game is a 1-up mushroom. This mushroom gives an extra life to Mario. These mushrooms are rare to find in the game.
Yoshi