I have been growing glads for years and never seen them do this. They have already flowered and now there seems to be some kind of bulb growing in the same place that it had a flower. I am waiting to see what it does but was curious if anyone new what this was.
Certified GKH Gardening Expert
This is just a seedpod. You can cut if off unless you want to harvest the seeds; however, starting glads from seed will take much longer to grow than from the corm itself.