sounds like mold, but could be "oak gall wasps".
an oak tree leaf duuh
The unknown leaf comes from the oak tree.
Green
leaf
They will come from the area where the leaf meets the branch usually.
depends on the type of oak tree there's red oaks and white oaks
Broad leaf
Blue Oak I just know it
needles?
no way its like planting a leaf
they need sunlight
the bark is the part of an oak tree that is most like a human skin