For The Magical Mixture Mill players, this guide will show you all the ingredients and their location in game.
All the ingredients in the game and their location
Full Shroompedia at this moment
Life
Producap
Collected with sickle
Gusto Grub
Drop with a small chance with rocks and ores all over the map
Life Lemon
Collected with sickle from trees with Life Lemons
???
Currently not implemented in the game
Mana
Mageroot
Collected with a pickaxe
Psyche Tick
Drops with a small chance with Producaps
Brain Fungus
Collected with sickle
Mandrake Bud
Collected with sickle
Dream Sac
Collected with sickle
Energy
Go-Go-Berry
Collected with sicklefrom trees
Glo-Wing
Drops with a low chance with Brain Fungus and Ghost Spores
X
Currently not implemented in the game
Cloud Shroom
Collected with sickle
Klaphat Sample
You can get it with an axe
Death
Gloom Bloom
Collected with sickle 
Mama Longfangs
Drop from strawberries and tree Life Lemons
Noxious Seed
Collected with sickle
?
Soul
God Wheat
Collected with sickle
White Knight
Drop with a low chance with Gloom Boom
Ghost Spore
Collected with sickle