Sometimes the pith will rot away leaving the cambium, but they can still be revived by getting them into loose good draining soil. Potting them up may help. Usually they can produce 1/2 inch diameter roots within the 1st season, and those tubers will fatten up each year, but the main key is to put them in soil that doesn't get damp.

It looks fine to me. As it has already been in a pot and has plenty of roots, I would plant in the garden as soon as possible. The top of the tuber should be your reference as to planting depth. Al

Thanks for feedback :)

Glad to hear it's fine. It's going in one of a couple new beds i have this year. I forgot to mention, my father says it never flowered. Thats probably the lack of light in the area he had it in. He can't remember the name, just that it was something chinese...or so he thinks. I'm a bit excited about it personally.

If it never flowered it could be becase it was planted too deep...top eye only 1" under the soil surface and it'll be fine.
Heather