The pollen was collected from the yellow-orange flowers outside Page House at 10:15 AM on 5/10/2019.

The pollen sample was obtained by gently brushing the anthers of the flower.

The ball lens of the foldscope appears to be approximately 1 mm in diameter. Judging from the picture of the pollen under the foldscope, approximately 15 pollen grains could line up end to end to fill the diameter of the foldscope. Thus a single pollen grain appears to be 1/15 = 0.067 mm or 67 micrometers in diameter. Given that the foldscope magnification is 140 x, it is reasonable that the pollen grains would appear to be this size.