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Summary: features include bronze to purplish brown fruitbody with ciliate margin, radially elongated diagonal whitish pores, central stem, and growth on hardwoods; found in BC, WA, OR, ID, also MB, NB, NS, NF, ON, PQ, SK, AR, CT, DE, IA, IN, KS, KY, MA, ME, MI, MN, MT, NH, NJ, NY, OH, PA, TN, VT, WI, WV, common in the east but rare in the west, (Gilbertson)
Cap: up to 6cm across and 0.5cm thick, usually single but sometimes several from branched stem base; bronze to purplish brown, not zoned; "shiny, with clusters of short, stiff dark hairs", margin becoming reflexed [turned up], "often appearing finely fringed or ciliate", (Gilbertson), 1.5-10cm,"circular, convex or depressed with an inrolled margin; yellow-brown to reddish brown or blackish brown; dry, densely hairy when young becoming almost smooth", (Phillips), yellow brown to dark brown, fading to tan, (Lincoff), cap surface finely tomentose, squamose, (Breitenbach)
Flesh: up to 0.3cm thick, corky; white, not zoned, (Gilbertson), 0.1-0.2cm thick, white, (Phillips)
Pores: 3-4 per mm, slightly decurrent, angular, with thin walls that become torn; whitish or ivory; glancing [showing a change in appearance from dull to lustrous when the orientation to light is changed], smooth; tube layer up to 0.2cm thick, ivory, (Gilbertson), 2-3 per mm, circular to angular, slightly decurrent; whitish; tube layer 0.1-0.3cm thick, (Phillips)
Stem: up to 4cm x 0.5cm, central, lighter in color than cap, (Gilbertson), 2-6cm x 0.1-0.5cm, "central or off-center, grayish or brownish; minutely hairy or smooth", (Phillips)
Odor: fungoid (Breitenbach)
Taste: mild (Breitenbach)
Microscopic: spores 6-7.5 x 2-2.5 microns, cylindric, slightly curved, smooth, inamyloid, colorless; basidia 4-spored, 16-22 x 5-6.5 microns, clavate, with basal clamp; cystidia absent; hyphae dimitic, generative hyphae of context 4-10 microns wide, colorless, thin-walled, with clamp connections, occasionally branched, binding hyphae of context with swellings up to 13 microns wide but mostly 4-10 microns wide, with dendritic branching and branches tapering to 1-2 microns wide, colorless, thick-walled, nonseptate, hyphae of trama 2.5-6 microns, similar, less frequently branched, (Gilbertson), spores 5-7 x 1.5-2.5 microns, cylindric to sausage-shaped, smooth, (Phillips)
Spore Deposit: white (Phillips)
Habitat / Range
annual, on dead hardwood, associated with a white rot, (Gilbertson), on dead hardwood, especially birch, (Phillips), fall, winter, early spring (Buczacki)
Polyporus arcularius has a generally paler cap and larger pores that are more elongated radially, and larger spores, (Gilbertson); Polyporus alveolaris has a paler cap, more lateral stem, and larger pores and spores, (Gilbertson)
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC:
Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for
Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
2021-01-24 5:15:08 PM
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