Certified GKH Gardening Expert
They are coprinoid mushrooms, but at this point very hard to tell exactly which. The caps turn into a mushy, spore-laden mixture and just so happen to stick to whatever they are touching at the time.
They are not considered harmful, by any means. You should not eat them, however, because some of the coprinoid mushrooms will cause serious discomfort.
Here is an article that will help you with the care of your plant: