Fallen leaves

You've already seen the oak leaves but you can tell which other trees are overhead or nearby at this time of year by looking on the ground.  

These nearly circular leaves with scalloped edges, in the photo below, fell from aspens.  Some are still green but gradually they turn through yellow to brown.  Can you spot a couple of oak leaves in there too?

And here we have hazel leaves mixed with the narrow leaves of white willow.  Find the aspen leaf in the middle.