One of my mushroom heads fell off

[Bonta]

I have 2 rocks of these Purp-Green and Purp - Blue mushrooms. Each of them open pretty wide except for 1 head. It was getting a little wrinkly and its center mouth was pretty wide. Now it just detached from its rock. Should I just leave it alone ?

 

[kingfisher62]

Some times if conditions are not right a shroom may let go. Happens to mine all the time.
I usually find it re-attaching some where else. most of the time for me it is a small one that is shaded out from others in it's colony.
I would not sweat it.

 

[kingfisher62]

Added note:
If it is happening to a lot of shrooms all at once, it would be caused by some type of stress.