Specialty Gardening: What is this growing in My Terrarium, 0 by Dimmer

Dimmer wrote:
I planted a terrarium with african violets leaves and now it is very over crowded so I started to Tansplant and I found all this in my Terrarium. they are long and course. I use the same potting as normal. I have never seen anything like this, 1 of my leaves were a Beefsteak Begonia leave but whan I pulled that out it had only 4 baby ears so I don't think that came from the begonia and AV's have hardlt any roots does any one else have this? Or do you now what it is Its allmost reminds me of fishing line
Dimmer/ Kim