Can I slice mushrooms that are still attached to rock?

[Liverockmia]

Hello to all. Everything I've read about fragging Shrooms says to slice them and then attach them to a rock. My question is will it be okay if I slice them while they are still attached to their original rock? Or will the two halves fuse back together? Thanks

 

[Reefpuck]

You can just cut them where they are. They shouldn't fuse back together (I've never seen it happen).