Two recent organic navel oranges had a lot of these 2-x-head-of-a-pin sized seed-like things. Each orange had maybe 25 of them clinging to the very center membrane in the orange. I allowed them to dry overnight and they do seem to feel like seeds, but obviously very small for orange seeds. They were also at the very center of the orange, not just off-center where orange seeds would be expected to be. What are they? EDIT: Better picture (marginally). When in doubt RTFM.
It seems pretty obvious that they are seedy things. But are they typical? Why have I never seen them before? Is it some kind of mutation trying to make our seedless oranges seeded again? What?
FURTHER EDIT: Strangely, these were the most flavorless oranges that I have ever encountered. Even the zest lacked any kind of orange flavor.