Small clumps of beige cottony stuff (for lack of a more suitable term) at the top of the photograph, growing on the underside of a weedy leaf in the wild. It’s probably a nest belonging to some kind of undesirable garden bug.
The gossamer-thin white silk-like strands the nest gave off I thought rather pretty.
The whole thing must surely serve as a source of nourishment for something - maybe other bigger bugs and beetles. Or birds.