As you suggest, I think this is just the honeydew excreted by scale or other pest. I suspect the strange shape is simply how the droplet spreads either as it falls on the leaf or as it is picked up by your sticky tape.
A single scale insect can produce a patch of honeydew on a leaf several inches distant from the actual insect. In other words they squirt it away from themselves in a fixed direction, as the scales are generally immobile.

On my potted citrus plants a patch of honeydew always indicates a nearby pest. A thorough search usually locates the problem on the underside of a leaf, or well-camouflaged on a nearby twig. Aphids and whitefly can also produce sticky deposits.

By the way, what microscope do you use to take these pictures? I am thinking of upgrading my digital microscope which is currently really a childs toy. Any recommendations?

I have no idea what that all is. I see no evidence of scale insects, though.

Hi Citrange!

My parents got this microscope when I was a kid so I have no idea what model it is. If I knew more about the types of microscopes out there I would suggest one. Sorry about that!