Looks like Daylily roots to me, do you see any signs of a "crown" or
growing point?

I'd pot it up in at laest a 1-gallon pot, fill the pot with siol, form
a cone in the center at least 2/3 of the way to the top of the pot.
Drap the roost over and around the "cone" and then fill in with
additional soil. Do not cover the very top of the roots, at least not
until new growth starts, then only about an inch of soil . Water it
thoroughly and then not again until it is growing. Place in a warm
spot with bright light and just see what happens.

Daylilies are pretty tough plants and you would be surprised by how
little of a root system is needed to grow a new plant (as long as there
is some "crown" there).

Good luck, and do let us know what comes of it.

Hemmaholic