Four chambered seed pods can indicate that the flower had extra petals and sepals (an obviously visible poly bloom) but many more in my experience are caused by the pistil alone having extra sections (not an easily visible poly bloom). Much of the time the extra "stigmatic branch" is visible at the top of the pistil but sometimes it is visible much lower down the pistil than the normal stigmatic branches. When I have pollinated those lower stigmas on purpose I find that they can also be fertile/productive.
White seeds usually are immature but not always. There are a very few (rare) cultivars that always produce only white seeds. Those white seeds are presumably mature and caused by a genetic mutation that prevents those specific cultivars from making the normal black pigment. 'Moonlight Orchid' is one of the cultivars that has been described as producing white seeds.
It is possible that any cultivar may accidentally produce mature white seeds occasionally due to non-genetic causes that prevent it making the normal black seed pigment. Testing the seeds, the squeeze test, will help determine if they are viable. Arisumi did some experiments to check how "young" seeds could be and still germinate. He wrote, "Although daylily capsules and seeds require 50-60 days to mature (VOTH, GRIESBACH, and YEAGER 1968), seeds harvested after 35 days have embryos that are nearly full grown and capable of germinating on filter paper or in nutrient agar. Therefore, capsules that were at least 5 weeks old were considered mature."
Note, how mature a capsule and its seeds are, will depend on the temperature at which it develops. Arisumi did his research in Beltsville, Maryland, so that should be taken into account when determining the minimum amount of time capsules need to become mature. If daylilies experience temperatures higher than those of Beltsville while the pod is developing, it will take less time; if they experience temperatures that are lower (on average) it will take somewhat more time.
