Tyromyces fumidiceps

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Ecology: Saprobic on the deadwood of hardwoods; causing a white rot; annual; growing alone or gregariously; often found along riverbottoms, creeks, and low-lying areas subject to floods; summer and fall; fairly widely distributed east of the Great Plains.

Cap: Usually present and well developed but occasionally present merely as a folded-over edge above a spreading pore surface; up to 6 cm across and 4 cm deep; convex; semicircular to kidney-shaped; velvety to slightly hairy at first, becoming bald; off-white, grayish, smoky gray, brownish, or grayish brown; soft.

Pore Surface: Whitish, becoming yellowish or pale olive in old age or when dried out; not bruising appreciably; with 4-7 angular pores per mm; tubes to 1 cm deep; tube mouths often becoming covered with crystals.

Stem: Absent.

Flesh: White; soft and watery when fresh.

Odor and Taste: Odor fragrant when fresh; taste not distinctive.

Chemical Reactions: KOH negative to yellowish on cap surface and flesh.

Spore Print: White.

Microscopic Features: Spores 2.5-4 x 2-3 ; smooth; ellipsoid to subglobose; hyaline in KOH; inamyloid. Cystidia absent, but occasional fusoid cystidioles present. Hyphal system monomitic, with conspicuous clamp connections; contextual hyphae with frequent short side branches.

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