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Hypholoma fasciculare
Small light brown mushrooms stacking on top of each other forming clumps.
Leaf litter under trees.
In the first photo I didn't notice the cedar (?) leaves, and only originally saw the oak leaf. I think Hypholoma capnoides could be another option.
I agree with Machi. Smooth cap and no stem ring or remnants of a stem ring suggest a different species.
Smooth cap is a good indication that a mushroom you have found is not Armillaria mellea