Observation by Jan Swammerdam (1637-1680), Dutch naturalist, of sporangia (spore capsules) of a Polypodium with, at a, the underside of a frond of the fern showing the position of the sporangia. Engraving. (Photo by: Universal History Archive/UIG via Getty Images)
Crédito:
Album / Universal Images Group / Universal History Images \ UIG