Summary:
Also listed in Toothed category. Features include a white to cream pore surface that becomes strongly tooth-like, and may bend outward to form white hairy caps, growth on hardwood, and microscopic characters including conspicuously incrusted cystidia and an absence of clamp connections. The description is derived from Gilbertson(1) except where otherwise noted. It is common in North America except in the southwest (Gilbertson).
Irpex lacteus has been found in BC, WA, OR, ID, AB, MB, NWT, ON, PQ, AL, AR, CT, DE, FL, GA, IA, IL, IN, KS, KY, LA, MA, ME, MN, MO, MT, NC, ND, NE, NH, NJ, NM, NY, OH, PA, SC, SD, TN, VA, VT, WI, WV, and WY, (Gilbertson).
Cap:
usually bent outward to form cap from flat growth on wood with pore surface exposed, or entirely flat, but occasionally bracket-like, up to 1cm x 7cm x 0.5cm, usually imbricate [shingled], semicircular or laterally fused, annual; upper surface white to cream or pale buff, margin colored the same; not zoned or faintly zoned, densely tomentose to hirsute, smooth or shallowly grooved
Flesh:
up to 0.2cm thick, soft-fibrous, not zoned; white to pale tan
Pores:
angular, 2-3 per mm near the margin, with thin walls that split deeply at an early stage to form teeth; white to cream; tube layer up to 0.3cm, continuous with flesh and colored the same
Microscopic:
spores 5-7 x 2-3 microns, oblong to cylindric, straight to slightly curved, smooth, inamyloid, colorless; basidia 4-spored, 20-25 x 4-6 microns, clavate, developing in intricate branched candelabra, simple-septate at base; cystidia conspicuous and abundant, "50-110 x 5-10 microns, projecting up to 40 microns, originating in the subhymenium from tramal skeletal hyphae", thick-walled, heavily incrusted apically, illustrated as cylindric; hyphal system dimitic: context generative hyphae 2-4 microns wide, thin-walled to firm-walled, with frequent branching, simple-septate, context skeletal hyphae 2.5-6 microns wide, colorless, "thick-walled, occasionally simple-septate, with rare branching", trama hyphae similar
Spore Deposit:
white (Lincoff)
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