Diaphanous bladder fern (Cystopteris diaphana) spore. Scanning electron micrograph (SEM) of the surface.

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Photo credit: © NATURAL HISTORY MUSEUM, LONDON/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 1700s, 18th, artwork, black, caucasian, century, cuming, dead, doctor, georgian, guilelmus, historical, history, illustration, male, man, monochrome, people, person, physician, portrait, scottish, surname, white, wig, william