Macrocybe titans
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Ecology: Apparently saprobic; growing alone or, more often, gregariously or in loose clusters in grassy or sandy areas, or in ground disturbed by landscaping (usually in the year after the disturbance to the soil)—or, in Central America, growing from ant colonies; fall and winter; In North America distributed from Mexico to Texas, Florida, and the Carolinas; also found in Central America, the Caribbean, and South America. The illustrated and described collections are from Florida and South Carolina.
Cap: 20-30 (reportedly up to 100) cm across at maturity; convex, becoming broadly convex or flat; dry; bald, but sometimes cracking in age or in dry weather; pale yellowish to brownish or buff; fading with age.
Gills: Attached to the stem; crowded; short-gills frequent; white to pale brownish.
Stem: 15-25 cm long; 8-14 cm thick; equal or slightly swollen; dry; whitish overall, with small, bent-back, brownish to whitish scales that become more prominent with age.
Flesh: White; firm; not changing on exposure.
Odor: Not distinctive.
Spore Print: Reported as creamy white.
Microscopic Features: Spores 5-7 x 4-5 m; broadly ellipsoid; smooth; hyaline in KOH; inamyloid. Lamellar trama parallel. Basidia 4-sterigmate; 30-35 x 5-8 m; clavate. Pseudocystidia scattered on gill faces, scarcely projecting; to 50 x 7.5 m; fusiform to lageniform, with or without an extended neck; thin-walled; with refractive contents in KOH. Pileipellis a cutis of elements 2-5 m wide. Clamp connections present.
