Bicellular Pollen of the Pond Lily, Nuphar advena at the Time of its Dispersal by Insects. (image) Botanical Society of America Share Print E-Mail Caption Bicellular pollen of the pond lily, Nuphar advena at the time of its dispersal by insects. The vegetative body of the gametophyte consists of a single cell and takes up the entire space within the pollen grain. A separate "generative" cell, that will eventually give rise to the two sperm cells, is free within the cytoplasm of the "vegetative cell." Shown are the nuclei of these two cells stained with a DNA-binding fluorochrome -- the bright one is the generative nucleus and the large, faint vegetative nucleus is directly adjacent to and surrounding it. Credit Joseph Williams. Usage Restrictions Cite original publication and credit line. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.