There is poison in these mushrooms!
The item id for Mushroom 0 in unturned is 2010. You can use this ID with the commands below to spawn the item, give it to a player or buy it on a modded economy server.
Useable: Consumeable
Size_X: 1
Size_Y: 1
Size_Z: 0.17
Food: 10
Virus: 10
Vision: 20
Asset_Bundle_Version: 2