idk you just find them probably in some bandit poi
i found them in bunkers that you can raid planted

The Beige mushrooms grow next to the Pinehurst police station. Next to the parking lot fence is a strech of greenery, it's in there.

Haven't found the brown mushrooms yet.

引用自 Fantail：

where do i find em? i *need* soup. I've looked everywhere and i can't seem to find them

i found all mushrooms.

1. Biege mushroom - In Pinehurst police station. Next to the parking lot fence is a strech of greenery, it's in there. (groows only in night)

2. Brown mushrooms - In secret bunker above the same city, between the lake and the mountain. U need 1 demolition charge for this mushrooms (to explosing door)

I found Brown mushroom seed in large animal stomach and milling machine too :)