The tuber begins its growth with the swelling of the seedling hypocotyl. It is a growth promoter of cucumber hypocotyl segments. The cotyledons sit on a short thick hypocotyl. Statoliths are also found in the endodermic layer of the hypocotyl, stem, and inflorescence stock. The green propagules/hypocotyl are also eaten by many Indigenous groups in northern Australia. After 260 to 280 days, it is formed to the harvestable hypocotyl. The mesocotyl is considered to be partly hypocotyl and partly cotyledon (see seed). Typically, celeriac is harvested when its hypocotyl is in diameter. The hypocotyl is thick, hairy and red. Most species develop a tuber from the hypocotyl, sometimes on roots. When the inhibition is alleviated late at night, the hypocotyl elongates. Tubers may form from the hypocotyl of the young seedling, as in "Cyclamen". The ubiquination of KAI2, therefore stimulate seed germination and inhibits hypocotyl elongation. In Europe the hypocotyl is used as a root vegetable. Their hypocotyl grows out into an ant-inhabited tuber.