Yes, the title of the photo is “Jumping spider (Salticus scenicus) with pollen”

Hah, ok, totally missed that, thank you. But it seemed an obvious candidate, they reminded me of those clingy balls that come off some plants so I figured they must be something like that.

Another class of biological thing that look broadly similar under magnification are fern spores. I guess moss spores too but I haven't seen those.

Interesting, I have some here I should look at them under a microscope.