No I'm pretty sure it's a mold. Other plants in the garden are showing the same symptoms, and they are not potted. For now I've clipped off the "infected" leaves on all plants in the garden and putting them in a sealed container.

The spots kept spreading on my babies too. Start out as small brown dots, then growing into spots with a lighter brown "halo" around them. Infected leaves turn yellow at a hellish rate. I hope there is a cure for this?

I'll make some more pictures when I get my cam back (somebody borrowed it from me for a couple of days)