Manchurian wild rice (Zizania latifolia), now rare in the wild, formerly harvested for its grain, now mainly cultivated for its edible stem known as 茭白筍|茭白笋[jiao1 bai2 sun3], which is swollen by a smut fungus
(variant of 菇[gu1]) mushroom
Definitions (CC-CANTO)
Zizania latifolia / wildrice/mushroom
Definitions (Wiktionary)
character
Manchurian wild rice (Zizania latifolia)