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Image Title: Pollination droplet secreted from tip of slender micropylar tube of Ephedra ovule
Image Credit: William E. Friedman, University of Georgia
AJB Editor: Nels R. Lersten, Iowa State University
Intended End User: Teacher, Student
License Details: BSA - Terms for Image Use
Copyright held by: William E. Friedman, BSA
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About the Image

Pollination droplet secreted from tip of slender micropylar tube of Ephedra ovule. Pollen adheres to the sticky, sugar-rich droplet, which later retracts to allow pollen to germinate in the pollen chamber adjacent to the female gametophyte.

Link to the AJB Abstract for the article:

The evolution of embryogeny in seed plants and the developmental orgin and early history of endosperm

National Science Foundation  Development Supported by the National Science Foundation