Scars, Buds, Etc.

What Core and Ammons in their handy Woody Plants in Winter call the “downy line across the top” of the leaf scar of a butternut (Juglans cinerea). The tawny suede-looking thing up there.
Mustache-like, but at the top, or outer edge of the scar.
Now, here’s the genus-mate eastern black walnut (Juglans nigra) for comparison. No mustache.
Sure, a lot of buds and leaf scars are tiny, necessitating magnification, but some are bold. The lustrous bud of American sweetgum (Liquidambar styraciflua), for instance.
This extremely fat red horse-chestnut (Aesculus x carnea), not at all sticky like standard horse-chestnut buds (Aesculus hippocastanum).
Norway maple (Acer platanoides).
This lipstick may be a magnolia.
And this is deceiving. Not buds but the work of Oak Rosette Gall Wasps (Andricus quercusfrondosus) and, of course, the oak itself.