Illustrations of various strains of pollen in extreme magnification, as featured in Ueber den Pollen (1837), a book by St. Petersburg based German pharmacist and chemist Carl Julius Fritzsche. For a key identifying each pollen type pictured see these descriptions (in German)
|Housed at: Internet Archive
From: University of Illinois Urbana-Champaign via Biodiversity Heritage Library
|Underlying Work: PD Worldwide | Digital Copy: No Additional Rights|
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The Dartmouth Electron Microscope Facility at Dartmouth College produced this photograph showing pollen strains at similar magnifications to those shown in Fritzsche’s book (around 500 times magnification).