bepah

I am no expert, but it looks to me that the mother pstem has been abandoned by the corm and is pushing out a new pstem.

My guess (it is hard to tell from the photos - they are blurry on my machine here) is that when you transplanted the plant, you planted it too deep and the mother pstem is rotting from to much exposure to water with the dead material at the bottom.

Just a guess....

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John Case
Rookie Gardener, Veteran Drinker