This particular seedling was already expressing mutant vascular development in one of the leaves, so it was culled.
My guess is that it came from a Northern Lights pollination.
@sativaman,
If you are referring to "Broccoli Casserole", yes it was totally arbitrary.
The seedlings in this diary, are from the same mother, but potentially four different male pollen donors.
My original Northern Lights female was crossed with Ketama, andto a lesser extent a Kwazulu.
The original NL had vascular mutation issues that propegated to my F1s, and F2s.
Now I know which ones I do not want to breed back.