There's definitely fungal going on. It's as complex, but more organized than the flatter, ribbony suspect larval strongyloids. They are often seen together and I wonder if they are reliant on each other or is one farming the other? Could they be different life stages of the same "animal"?
Strongyloids are chemo-attracted to urocanic acid which is in our skin and sweat. Many of the fungal filament threads I find are from my immediate environment, still connected to the inside of my clothing... growing mostly in the "sweat spots".
?? This last one looks like it could be stretching from a filament into a flatter version:
