um, it looks as if the parts of the roots closest to the crown rot/exposed to air are being affected, and I take that to mean the rot is spreading... I would treat the roots and potting medium with some physan 20 right away, and then keep an eye to see if the black spreads any more. If it does you're gonna have to chop those roots I think. But it looks like it's got some good root growth going, so I wouldn't worry that it would hurt the plant terribly. It's better to ease as much of the plants stress as you can so it can focus on new growth instead of fighting infections ect.
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