The next discovery I first thought was a fungus - threads handing from a dead pine needle suspended in a tree. But after much research, this turns out to be lacewing eggs. They are laid on hair like filaments, said to prevent the larvae from cannabalizing each other. The larvae are so voracious that they have been considered for biological insect control. Curious!
The final, less pleasant, find was a nest of thousands of little black flies. I have yet to identify them, but they looked like fruit flies and swarmed all around us at dusk. The nest was around the base of a tree and was a seething mass of emerging tiny flies. Creepy and crawly, to be sure!