The mouth is in the middle. It looks like a possible 3 way split from the mouth moving out to the edge but it's really hard to tell. Every mushroom I've ever had split balls up for a couple of days and then when it unrolls there's two and they slowly move away from each other. One section does look like it grew a new foot so I'm hopeful...Is there a mouth on the other side? I know very little about successfully keeping mushrooms.