Does anyone know what this is?

[jemerman]

This is happening to all of my stupice plants. The leaves grow with a downward curl, with odd white growths on the veins on the bottom of the leaves. Eventually the veins shrivel up and then the whole leaf dies and falls off. I just brought the plants outside today, they have been indoors under lights since germination.

Anyone have any idea what this is? Is it something that may go away after taking them outside, or should I just toss the plants?

Thank you.

Here are a few pics.