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Summary: features include pale reddish yellow circular to asymmetrical fruitbody, large radially elongated diamond-shaped pores that are white to tan, buff stem that is central to lateral or absent, and growth on hardwoods; found in BC, ID, also MB, NB, NS, ON, PQ, SK, AK, AL, AR, AZ, CO, CT, DE, FL, GA, IA, IL, IN, KS, KY, LA, MD, ME, MI, MN, MO, MT, NC, NE, NH, NJ, NM, NY, OH, PA, TN, VA, VT, WI, WV, Japan, Europe, (Gilbertson), reported from WA by Andrew Parker, pers. comm.
Cap: circular to dimidiate [roughly semi-circular]; pale reddish yellow, when old becoming ivory to pale buff; fibrillose to squamose [scaly] with flattened triangular squamules [scales], when old bald, smooth, not zoned, (Gilbertson), 1-9cm, semicircular or oval in outline; "pallid reddish yellow; scaly at first", (Phillips), 2-8cm, roughly kidney-shaped; ochreous cream; marked by radial fibrils, sometimes joined to form small appressed scales, (Lincoff(1)), 1-10cm, semicircular to kidney-shaped or fan-shaped, reddish yellow to pale red, weathering whitish; somewhat scaly becoming smooth, (Lincoff(2))
Flesh: less than 0.1cm thick, corky; pale tan to ivory, not zoned, (Gilbertson), white, (Phillips)
Pores: 1-2 per mm tangentially, diamond-shaped, radially elongated, with thin walls that become torn; white to tan; tube layer up to 0.5cm, continuous with flesh, (Gilbertson), 0.5-3 mm across, "hexagonal; white or dull creamy"; tube layer up to 0.5cm thick; whitish tan, (Phillips), broad, alveolate, polygonal, often with fine hairs, (Lincoff(1)), 0.5-3 x 0.5-2 mm, 6-sided to diamond-shaped or honeycombed, usually in radial rows; white, drying yellowish, (Lincoff(2))
Stem: up to 1cm x 0.5cm, but sometimes absent; central to lateral; buff; bald, (Gilbertson), about 1cm long, lateral, short, or absent; colored like pores, (Phillips), 0.4-1cm x 0.5-0.8cm, lateral, very short, rudimentary, leathery then rigid and fragile; whitish; often reticulate down to base, faintly pubescent, (Lincoff(1))
Odor: no special odor (Lincoff(1))
Taste: no special flavor (Lincoff(1))
Microscopic: spores 11-14.5 x 4-5 microns, cylindric, smooth, inamyloid, colorless; basidia 4-spored, 28-42 x 7-8 microns, clavate, with basal clamp; cystidia none, "hyphal pegs frequent, 40-50 x 17-40 microns"; hyphal system di-trimitic, generative hyphae in context 2.5-4 microns wide, colorless in KOH, "thin-walled, rarely branched, with clamps", binding hyphae in context 3-7 microns wide, "thick-walled, nonseptate, much branched, with tapering apices, others with rare branching"; hyphae of trama similar, (Gilbertson), spores 9-11 x 3-3.5 microns, cylindric, smooth, (Phillips), spores 7-12 x 3-4 microns, (Lincoff(1))
Spore Deposit: white (Phillips)
Habitat / Range
annual, on dead hardwood, associated with a white rot, (Gilbertson), on dead hardwood (Phillips), summer and fall (Miller)
Polyporus arcularius usually differs in having central stem, and in having smaller spores, (Gilbertson); Polyporus brumalis also has more or less radially elongated, diamond-shaped pores, but they are much smaller than those of P. alveolaris, cap is darker, stem more central, and spores are smaller, (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:
2020-08-07 10:57:56 AM
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