Ken - I agree that creating a tent-like structure to propagate FLF cuttings is a lot of work, but some folks like to give most anything a try. If the potting mix starts out properly moistened and good light is provided and the tent is well sealed, it does work although there are no guarantees and many things can go wrong.
I don't know the explanation for the white nodules but they can safely be ignored. For sure, air-layering is the preferred method.
