I found some small, round objects on my Cycas revoluta. 100X magnification:
I took a few amateur pics in my microscope with my ill-adapted digital camera:
Shining a blue LED on the object reveals the texture:
Found on the underside of dying leaves on this particular plant:
They are about 0.2 to 0.5mm across, if I remember and judge correctly.
Any help would be appreciated.