technically rhizomes are just really big, modified root/stem structures that store the "food" that the plant takes in. then they spread either under the ground or sometimes on top of the ground and make little offshoots. same thing with Cobra lilies and flytraps (except the flytraps don't grow the rhizome horizontally like the Cobra Lilies and Cephs). hence the reason they say to make sure you get white rhizome on a flytrap leaf when doing a leaf pull. so, in essence it's the main root/stem, and the thin "roots" you see are the secondary roots that it uses to anchor the plant. so like it's been stated, if you have the main rhizome root (and it looks like you do), and it isn't "damaged", then hopefully you'll get some more Cephs