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Species Information
Summary: Oxyporus populinus forms perennial bracket-like to shelf-like cream to buff fruitbodies on live hardwoods, especially maple, frequently in tiers, and frequently moss-covered on the upper surface. Pores are small and whitish to yellowish. Spores measure 3.5-4.5 x 2.5-4.0 microns and cystidia are thin-walled and apically encrusted.
Oxyporus populinus has been found in BC, also MB, ON, PQ, NS, AR, CT, DE, GA, IA, IL, IN, KS, KY, MA, MD, ME, MI, MN, MO, NC, NE, NH, NJ, NM, NY, OH, PA, RI, TN, VA, VT, WI, WV, (Gilbertson), also Europe, Asia, Africa, Australia, (Breitenbach)
Cap: 3-6cm along wood, 2-3cm wide, 1-4cm thick, "semicircular to elongated in tiers"; "whitish gray to pale gray-buff, often with an ochraceous tint, frequently tinged green from algae or moss; uneven, finely and densely hairy becoming smooth to warty, often overgrown with moss", (Phillips), up to 5cm x 12cm x 5cm, bracket-like, or bent outward to form shelf-like cap(s) from pore surface growing flat on wood, often imbricate [shingled] and laterally fused; cream to buff or darkening when old; finely tomentose to bald, often covered with mosses at base, (Gilbertson), usually overlapping, in large vertical masses, (Lincoff), general consistency elastic and soft, when dry hard and brittle; margin sharp, white, undulating, (Breitenbach)
Flesh: "watery, firm; white to ochre", (Phillips), up to 2cm thick, corky; faintly zoned to not zoned, cream to tawny, (Gilbertson)
Pores: 4-7 per mm, circular to slightly angular, whitish; tube layer 0.2-0.5cm thick, up to 4cm thick in old specimens, new layer each season; whitish then straw yellow, (Phillips), 5-7 per mm, circular to angular; cream to buff; tube layer up to 5cm deep, distinctly stratified, separated by thin layer of flesh, tubes colored as pore surface, (Gilbertson), pore surface white to cream or yellowish orange, up to 20 tube layers, (Lincoff)
Microscopic: spores 3.5-4.5 x 2.5-4 microns, nearly round, smooth, inamyloid, colorless; basidia 4-spored, 8-12 x 5-5.5 microns, ovoid to broadly clavate, simple-septate at base; cystidia abundant, 20-35 x 3-4.5 microns, cylindric to clavate, thin-walled, "capitately to entirely incrusted, incrustation dissolving rapidly in KOH", incrusted portion 6-12 microns wide; hyphae monomitic, hyphae of context 2.5-4.5 microns, colorless, thin-walled to thick-walled, simple-septate, hyphae of trama similar, mostly thin-walled, (Gilbertson), spores 3.5-4.5 x 2.5-4 microns, nearly round, smooth, (Phillips), 4-5.5 x 4-5.5 microns, round, smooth, colorless, (Lincoff), spores 3.5-4.5 x 3-4.5 microns, nearly round, smooth, inamyloid, colorless, some with droplets; cystidia exserted beyond hymenium, 15-20 x 4-7 microns, thick-walled, capped with crystals, (Breitenbach)
Spore Deposit: white (Phillips)
Habitat / Range
perennial, on living hardwoods, especially Sugar Maple, associated with white heartrot of living trees, (Gilbertson), on trunks or in wounds of hardwood trees, especially living maple, (Phillips), on hardwood, especially from old wounds or knot-holes, typically on sycamore, all year, (Buczacki for Britain/Ireland)
