What's this weird white/yellow stuff?
I've seen several different...things...growing on/around my plants and wondered if I could get help IDing them.
Right now I'm most concerned about this stuff which seems to grow anywhere on the surface (we use mixed coconut), and recently I've seen it growing up stems of some plants. It's all indoors. Sometimes it's more yellow or more white, more bumpy or crusty; maybe it's not all the same thing?
What are they? Is it harmful to the plants, or to people/animals who might eat it?