Ground-up or finely shredded bark used as mulch will grow artillery fungus like you wouldn't believe; even faster than in other forms of wood mulch.
Of course, if the mulched area isn't within 30 feet of a house, garage, vehicle, or any other item that you wouldn't want to have peppered with permanent, non-removeable tiny black dots, that doesn't matter....
I will never EVER have any form of wood mulch within 50 feet of any of the above items, again. Worst mistake of my gardening life.