Unfortunately this was the best I could do; it was incredibly tiny. I think it was about 1 cm in length. Upper Peninsula of Michigan on some moss at the base of a mature white pine tree. Hopefully that information helps; I know some fungi and molds can be quite particular.
Embarrassing if so. But I'm not aware of any nearby food sources that would give them purple droppings. We also have a bird feeder in our yard and all the droppings on it are the normal color.
I’m not an expert so definitely take my comment at face value.