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Summary: features include tough thin circular tan to chestnut brown cap that becomes depressed, small pale buff pores, central to lateral stem that is brown at top and black at base, and microscopic characters including generative hyphae with clamp connections; the species has been regarded as a synonym of Polyporus varius, but the online Index Fungorum, accessed September 8 synonymizes it with Polyporus leptocephalus (Jacq.) Fr.; found in BC, WA, OR, ID, also AB, MB, NS, ON, PQ, YT, AK, AL, AR, AZ, CA, CO, CT, DE, GA, IA, KY, MA, ME, MI, MN, MT, NC, ND, NE, NH, NJ, NY, OH, PA, TN, UT, VA, VT, WI, WV, WY, (Gilbertson)
Cap: 1-4(9)cm across and 1cm thick (usually 0.2-0.3cm thick), circular to kidney-shaped or fan-shaped; tan to chestnut brown, not zoned; bald, (Gilbertson), 1.5-7cm, round to kidney-shaped, convex becoming depressed or umbilicate; pale tan to ocher, often weathering to white; smooth or finely striate; margin often wavy or lobed, (Arora)
Flesh: up to 0.7cm thick, corky, not zoned; pale buff, (Gilbertson), thin, tough when fresh, rigid when dry; white to pale cinnamon, (Arora)
Pores: 5-7 per mm, circular to angular; pale buff; tube layer up to 0.2cm thick, colored as flesh or slightly darker, (Gilbertson), 4-6 per mm, usually decurrent; white when fresh, often grayish or brownish when old; tube layer thin, (Arora)
Stem: up to 7cm x 0.5cm, central or lateral; base black, upper part colored as cap, bald, (Gilbertson), 0.5-5cm x 0.2-0.6(1)cm, central to lateral, tough, "more or less equal or swollen at base"; pallid or tan in upper part, soon black in lower part, (Arora)
Microscopic: spores 7.5-10 x 2.5-3 microns, cylindric, slightly curved, smooth, inamyloid, colorless; basidia 4-spored, 15-20 x 6-7 microns, broadly clavate, with basal clamp; cystidia none; hyphae dimitic, generative hyphae of context 2.5-4 microns wide, thin-walled, with clamp connections, binding hyphae of context 2.5-5 microns, thick-walled, nonseptate, much branched; hyphae of trama similar, (Gilbertson), spores 6.5-10 x 2.5-4 microns, cylindric, smooth, (Arora)
Spore Deposit: white (Arora)
Habitat / Range
annual, usually single, on dead hardwoods, occasionally on conifers, associated with white rot of dead hardwoods, (Gilbertson), single or several together "on decaying hardwood sticks, branches and debris (only rarely on conifers)", (Arora)
Polyporus badius is usually larger, has darker cap and most often entirely black stem, and often grows on logs and stumps whereas P. elegans is more common on branches and sticks, (Arora), P. badius has dark brown or blackish brown cap, usually larger size, and lacks clamp connections, (Gilbertson); Polyporus varius has a radially streaked cap and is intermediate in color between P. elegans and P. badius, (Arora), P. varius has radially streaked cap (Gilbertson); Polyporus melanopus has "a velvety stem and velvety-scurfy cap, at least when young" and "grows from the ground or from buried wood", (Arora), P. melanopus is generally larger, has black velvety stem, and grows on ground, (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 12:16:38 PM
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