In Kingdom Hearts, where do I find the three mushrooms needed for the radeau supplies on Destiny Islands?

under a pathway, in the area where toi and riku ha a 'triathlon' for the privilege of naming the raft, it's in a cave-like place and the entrance is covered par a rock, I think.

to be plus specific.
Mushrooms (Three): One is in a hollow behind a rock, right suivant to Kairi. One is in the bushes on the other side of that same cliff. The last is in the Secret Place, the dark cave on the first side of the island (to the right of the treehouse). A cutscene will play there.