I started my mother yesterday at 6:00am. with 2 tsp salt and 2 tbsp honey, 4 cups potato water, 4 cups unbleached natural wheat flour. I was told to wait two to three days. Well, 24 hours later I lifted my wicker top and the thing was absolutely frothing. I told my wife 2 hours later to check it and she said there was some green mold on it, but it smelled okay. Reading some of the question responses, it looks like I can scrape it off and put the mother in the fridge overnight. Is that true?
You should be able to just scrape the mold (I suspect due to the honey in the recipe) off and continue as normal providing there was only a little bit of mold on the surface.
If there was quite a lot or you're unsure about it then you could discard most of it then use just a tablespoon or two of the mother to seed another starter. Then if after 1 or 2 'feedings' it smells yeasty and is frothing nicely then it should be perfectly fine to use.