I have been using s system for several years also using 1.5 mil centrifuge tubes.
I stuff a wad of cotton in the tube to about a quarter inch from the top, tamped down, I use the blunt end of a Sharpie.
I wrap the tube with a piece of masking tape so I can write down name of plant with pollen inside tube.
I will take the tubes out to the garden and pull off stamens near the base and brush off the pollen to the cotton surface, there is always some pollen left in the groves of the anther if you still want to use it fresh.
It takes on average all six anthers to completely cover the surface of the cotton in the tube.
Tubes are stored in the freezer for use, and can be re froze several times, I found that the fluid on the stigma eventually will make the surface hard, and that tube is essentially used up.
I have set pods in my yard with my pollen that was 5 years old. so it appears pollen stored in a freezer will last a very long time.
Last year I experimented with growers in Georgia and California shipping pollen.
The Georgia grower we shipped early in a doubled walled thermos, and later in the middle of summer through regular mail in bubble wrap envelopes.
What we found is that we set pods both ways, we were worried that the heat would kill the pollen shipped south and west, but even though the temps in both places were in the 90's it didn't seem to matter.
I'm no expert but I believe the tubes with only cotton and pollen stayed dry through the whole process, no stems or anthers to spoil or contaminate pollen with excess moisture in the shipping.
I expanded shipping partners this last season to about 10 people ranging from Canada to Louisiana, that's about the max for my ability to collect and share, with the newest plants even 10 partners is to many.
Northern growers ship to southern growers in the winter, and southern growers ship north in June right before the northern season start.
We have had success setting pods with everyone willing to try using frozen pollen.
In my opinion fresh is best, but with overlapping bloom seasons and not being able to grow every daylily, sharing pollen does make it possible to try new things before buying or owning plants.
I should add that if you can't set a pod on a plant using fresh pollen, frozen pollen will not set one either.
Success rates have vary, but I have pods from stuff I could only dream of before, my partners are enthusiastic seeing the results.
These are the pictures I shared with my partners for collecting and using pollen.
