Without getting into all the fancy scientific components of the root, I second Ray's concern. If the velamen has rotted and gone, even though it is a layer of dead cells, my interpretation is that it is an indication that the remaining components of the root (insert scientific terminology here), which I will just call the "stringy" part, have also died. So we would need to determine whether that "stringy" part still consists of active, living cells capable of transporting water and nutrients or if that "stringy" part is now dead and unable to perform it's function anymore.
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