Tiny Ascomycete Fungus Dendryphion comosum
This forms an untidy fuzz on the stems of some perennials, in this case dead Goldenrod stems on the ground.
These are extremely tiny fruiting bodies, the highest magnification being of a FOV 3.5mm wide.
Olympus EM-1 (manual mode), Olympus 4/3 x2 TC, Olympus 4/3 50mm f2 macro, f13, triple flash hand-held.
Olympus EM-1 (manual mode), Laowa 25mm f2.8 2.5x-5x ultra-macro at f11, twin TTL flash hand-held.
The stereo is crosseye.