It seems there's a slight misunderstanding in your question. Gymnosperms and angiosperms don't produce pollen seeds. Here's a breakdown:

* Pollen: Pollen grains are tiny structures produced by both gymnosperms and angiosperms. They contain the male gametes (sperm cells) and are essential for fertilization.

* Seeds: Seeds are produced by both gymnosperms and angiosperms as well. They contain the embryo of the future plant and a food source for its development.

Here's how it works:

* Pollen is released from the male reproductive structures of the plant (cones in gymnosperms, anthers in angiosperms).

* Pollen is transported by wind or insects to the female reproductive structures (cones in gymnosperms, stigma in angiosperms).

* Fertilization occurs when the sperm from the pollen grain travels to and unites with the egg cell within the ovule.

* The fertilized ovule develops into a seed.

So, instead of producing "pollen seeds," gymnosperms and angiosperms both produce pollen grains and seeds, each with a different role in the plant's reproductive cycle.