This is how it should look
Unfortunately I only notice these little grey buttons on an acacia leaf while checking a photo of the black tooth fungus. There was just one acacia leaf with several of these grey fungi, each about .5 mm wide.
On an acacia leaf (probably A. melanoxylon) which was sodden like the rest of the leaf litter - Long Point Reserve
This was an exciting find but a little too late. I thought it best to document it and perhaps search specifically for these on the next visit.
These disc-shaped fungi are on short stalks and have spaced stiff hairs along the rim.
Family : Sclerotiniaceae