Hesperidium is the name given to certain types of fruits.
Hesperidia are berries with a tough, leathery skin that tends to be bitter.
If you cut a hesperidium open, you will see separate compartments, called carpels. Within these carpels, you will see hundreds of tiny, fluid-filled vessels that are made out of specialized hair cells. These vessels are called vesicles.
If you haven’t already guessed, all citrus fruits are that special type of berry, known as hesperidia.
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