Entry from US English dictionary
Definition of pollen grain in English:
Each of the microscopic particles, typically single cells, of which pollen is composed. Pollen grains have a tough coat that has a form characteristic of the plant producing it.
- The pollen grain is the male gametophytic phase of flowering plants.
- The pollen grain (male gametophyte) is a three-celled structure composed of two generative cells encased within the vegetative cell.
- The transfer of the pollen grain (male gametophyte) from the stamen to the stigma initiates the processes that can result in fertilization.
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