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Panus rudis

[ Basidiomycetes > Polyporales > Polyporaceae > Panus ... ]

by Michael Kuo

Panus rudis is easily recognized by its habitat on the recently dead wood of hardwoods, its densely hairy cap, its white mature gills, and its off-center stem. The color of the cap varies from purple to pinkish brown, orangish brown, or tan--but the hairiness does not vary. The stem is sometimes nearly absent, leading to potential confusion with faded specimens of Phyllotopsis nidulans, but the latter has orange gills that usually manage to resist fading even when the cap is no longer bright orange.


Ecology: Saprobic on the wood of recently dead hardwoods; growing alone, gregariously, or in tight clusters; spring through fall (also winter in warm climates); widely distributed in North America.

Cap: 2-10 cm wide; convex with a tightly inrolled margin at first, becoming depressed or vase-shaped with an even margin; round in outline or irregular; densely hairy with hairs 1-2 mm long; often purple at first, but soon fading to reddish brown, pinkish brown, orangish brown, or tan.

Gills: Running down the stem; crowded; sometimes purplish when fresh and young, but soon whitish.

Stem: 1-4 cm long; up to 1 cm wide; tough; often off-center or lateral; dry; densely hairy; colored like the cap or paler.

Flesh: Whitish; tough.

Odor and Taste: Odor not distinctive; taste mild or bitter.

Spore Print: White.

Microscopic Features: Spores 4.5-6.5 x 2.5-4 µ; elliptical; smooth; inamyloid. Pleurocystidia ("metuloids") to 60 x 13 µ; subclavate to subcylindric; with very thick walls, except at the apex. Clamp connections present.

REFERENCES: Fries, 1838. (Saccardo, 1887; Kauffman, 1918; Smith, Smith & Weber, 1979; Pegler, 1983; Weber & Smith, 1985; Arora, 1986; Lincoff, 1992; Metzler & Metzler, 1992; Roody, 2003; McNeil, 2006; Miller & Miller, 2006.) Herb. Kuo 07280604.

Lentinus strigosus (in part) and Lentinus rudis are synonyms. Pegler's monumental 1983 monograph of Lentinus placed Panus rudis and Panus conchatus in Lentinus, subgenus Panus, but DNA studies (Hibbett & Donoghue, 1994; Hibbett and collaborators, 1997) have not supported a close relationship between Panus and the rest of Lentinus.


Panus rudis

Panus rudis

Panus rudis

Panus rudis

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Kuo, M. (2007, April). Panus rudis. Retrieved from the MushroomExpert.Com Web site: