Hypsizygus ulmarius at Patapsco

This is a picture of a Hypsizygus ulmarius along the Grist Mill Trail at Patapsco Valley State Park in Baltimore County, Maryland.

The Elm Oyster

Cap: 5-15 cm; convex with a slightly inrolled margin at first, becoming almost flat, with a slightly sunken center; white, turning to creamy buff or tan; cracking and forming small scales or patches.

Gills: Attached to the stem and not running down it; close or nearly distant; whitish, becoming cream.

Stem: 5-10 cm long, 1-2.5 cm thick; dry; smooth to hairy; whitish; solid; stout; off-center to nearly central; sometimes enlarged at base.

Flesh: Firm; white.

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Similar species: Agaricales

Species identified by Matthew Beziat