Here are the bulbous parts that Linda was refering to. These grow underneath the small brown corms on the Purple Oxalis.
I had never seen this before! It really blew me away! So weird! But--I had the Oxalis planted in a heavy clay W-Box
with really good soil in it- and I think it just went to town.
When freshly dug up, these large roots seem almost translucent. Then they dry and get a dull appearance.
You said it was attached to an Oxalis. It COULD be possible??? The fuzz could just be a fungus growth/covering
that may be thriving on the soil around this root. just guessing here......