A mushroom was the fruiting body of certain fungi. Many varieties were edible and used in assorted culinary dishes.
In 1986, Doctor Gillian Taylor ordered a mushroom and pepperoni with extra onions pizza at an Italian restaurant. (Star Trek IV: The Voyage Home)
In 2267, while trying to bait a Omicron spore-infected Spock, James T. Kirk called him "A carcass full of memory banks who should be squatting in a mushroom". (TOS: "This Side of Paradise")
Mushroom soup was one of Chakotay's favorite foods. In 2371, Seska found some mushrooms on a planet in the Delta Quadrant, and made it for him. (VOY: "State of Flux")
In 2372, Tuvix toned down the spices in Neelix's recipe for Trellan crepes to allow the taste of mushrooms to come through. When he explained this to Kes, she told him she loved the mushrooms. (VOY: "Tuvix")
Tom Paris suggested grilled mushrooms to Harry Kim as a first meal after being rescued from an Akritirian prison in 2373. (VOY: "The Chute")
When Worf and Jadzia Dax briefly called off their wedding in 2374, Julian Bashir took the opportunity to break from Kal'Hyah and order a steak with mushrooms, a baked potato, sour cream, and chives. (DS9: "You Are Cordially Invited")
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