Macrocybe titans: Cap is extremely large, often reaching up to 100 cm in diameter.
Large white Leucopaxallus: Cap is noticeably smaller, typically up to 20 cm in diameter.
Macrocybe titans: Found in tropical and subtropical regions, particularly in Central and South America, as well as southern parts of North America.
Large white Leucopaxallus: More widely distributed, found in many temperate regions worldwide, including North America, Europe, and Australia.