So the wiki says.
Stardew valley mushroom floors and infested levels.
However it does not move to the next floor that floor still counts as a day so there will be no mushroom floor on the days it lands on a 5 or a 0.
Note that no mushrooms will spawn on an elevator floor floors ending in 0 or 5 or if the floor is infested see previous section additionally the mushroom floor is neither unique nor guaranteed there may be multiple active mushroom floors or no such floors at all on a given day and that situation may persist for several days or weeks.
It does not yield seeds when shaken or chopped down but it will spread seeds like a common tree.
Meaning one day it can be floor 90 and you won t see it.
The mushroom floor will go up 1 floor everyday if it s on floor 83 on the 3rd on the 4th it will be on floor 82.
They can also be found in the secret woods during spring and fall and on the forest farm during summer.
If unobstructed seeds spread by a mushroom tree have a 20 chance to grow to the next stage each day during spring.
Each passing day the floor moves backwards.
It can be chopped down using an axe and will drop 5 6 red or purple mushrooms plus one for the stem.
You could return to the same level multiple times per day and it would always be infested and would move one level up in the mine each day you rested.
I noticed today while playing the a level infested with slimes was moving in a predictable pattern.
The purple mushroom is found via foraging in the mines starting at level 81 the skull cavern from a tapped mushroom tree rarely or grown in the mushroom cave rarely.
It can also be received as a gift at the feast of the winter star.
So far i have tested this over a 5 day period when i found the infested floor on floor 68.
One reason you are not finding the mushroom floor is because the mushroom floor has a chance to spawn zero mushrooms.
If its floor 117 today it will be floor 116 the next day.
Infested floors use the same rules as mushroom levels in that they travle a floor up the mine each day.
The common mushroom is a mushroom found via foraging throughout stardew valley in the fall.
They can also be obtained by tapping a mushroom tree.
A mushroom tree is a tree that spawns according to a rare event in fall.
They can be grown from wild seeds fa or in mushroom bins in the the cave if the mushroom option is chosen.
However the mushroom floor will not appear on floors ending in a 5 or a 0.
This makes them farm able which is important for those looking to get two rings in particular.
It does not show in 0 s or 5 s floors.
On year 2 summer 8th the infested level was at 53 on year 2 summer 12th the infested level was at 49 the pattern continued consistently on the.
As there are 120 floors in the mine and 112 days in the stardew year you should be able to say.
