They are also referred to as 'false seed pods' since they look very much like the real thing after it has grown a fully developed seed. If you have a plant that has been pollinated, either accidentally or thru a little selective dabbing of pollen to produce a small amount of seeds, the mature seeds will be found in similar pods in amongst the buds. If you want to get a batch of seeds without ruining the potentcy of the whole plant, then just dab pollen on a few buds (be sure to mark their location so you can find them easily when you harvest). You will be looking for those pods buried inside the buds. There will be 'empty' pods like those on a normal mature plant at the juncture of the stems. Pollen sacks are more like a cluster of grapes and grow on a short stalk. If you look at them closely, you will see they are formed by petals that are sealed to make the pod (where the pollen is stored until ready). When mature, the pod bursts to spread its load and the result looks like a flower when opened. If you choose to make seeds, be sure to keep the male far away from your females. When the pods begin to swell, it means it has a full load of pollen dust and will soon pop open to release it. You can pluck these larger pods and break them open to save the pollen, or just wait until they sprinkle their stuff over the fan leaves and try to brush it off into a container.