Origin of pollen grain
Examples from the Web for pollen grain
Historical Examples of pollen grain
After the entrance of the pollen-grain the pollen-chamber becomes roofed over by a blunt protuberance of nucellar tissue.
Or we may think of the shrunken dark star as the germ-cell, the pollen-grain, of the cosmic organism.A History of Science, Volume 3(of 5)
Henry Smith Williams
Within the pollen-grain is the granular protoplasm with some oily particles, and occasionally starch.