Whazzit?

 On last weekend's hike on Mill Creek Trail, we went through the muddy stretch looking for the showy flowers, like Leopard Lilies, that are not yet blooming.  But, among the many other interesting sights was the fuzzy stuff growing on the branches of young White Alders.  It reminded me of a similar sight on the Oakland Camp Road by a wet spot that lasts most of the summer due to seepage from the hill toward the railroad tracks.  Not sure what it is, but I had to touch it.

I couldn't see anything moving inside, but it was bad lighting and my eyes were tired.  My best guess is Wooly Aphids.