Pollen tubes

The pollen tubes penetrating the stigma on this ancient flower are the only known fossil of this type, showing the process of sexual reproduction in a flowering plant. (Photo courtesy of Oregon State University)

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Taken on March 21, 2013
  • ƒ/4.4
  • 63.0 mm
  • 0.3
  • 400
  • Flash (off, did not fire)
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