Stereum hirsutum

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Ecology: Saprobic on the dead wood of hardwoods, especially oaks; growing densely gregariously, often from gaps in the bark, fusing together laterally; causing a white rot of the heartwood; often serving as a host to algae; sometimes parasitized by jelly fungi; spring, summer, fall, and winter; widely distributed in North America.

Fruiting Body: Individually .5-3 cm across, but often fused together; fan-shaped, semicircular, or irregular; densely velvety, hairy, or with appressed hairs; with concentric zones of texture and color; colors variable, but generally ranging from yellow to tan, brown, reddish brown, or buff (sometimes developing greenish shades in old age as a result of algae); laterally attached, without a stem.

Undersurface: Smooth; yellowish to yellow-brown or grayish brown; sometimes bruising darker yellow.

Flesh: Insubstantial; tough.

Chemical Reactions: KOH red (or at first red, then black) on all surfaces.

Spore Print: White; difficult to obtain.

Microscopic Features: Spores 5-8 x 2-3.5 ; smooth; cylindric or narrowly elliptical; amyloid. Hyphidia with rounded to subacute apices; without projections (pseudoacanthohyphidia and acanthohyphidia absent).

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