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Gyromitra caroliniana, known colloquially as Big Red in Missouri and Kansas, or Beefsteak mushroom, is an ascomycete fungus of the genus Gyromitra, found in the southeastern United States. Growing to large sizes, it is found in spring and is collected and eaten by some. However, there is some suggestion it may contain gyromitrin like its poisonous relative, the false morel G. esculenta. It belongs to the Pezizales group of fungi.
The fruiting body, or basidiocarp, appears in woodland, and can grow to massive sizes. The heavily wrinkled cap is red-brown in colour.
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