Nehemiah Grew
Much of Grew's pioneering work with the microscope was done at the same time as that of Marcello Malpighi. The two reportedly borrowed freely from one another. Grew's work on pollen was more extensive than that of Malpighi. It led to the discovery that size and shape is different between species, whereas pollen grains within a species are all alike. This discovery is central to the field of micropaleontology.