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Species Information
Summary: Oxyporus latemarginatus forms a whitish pore layer growing flat on hardwoods, and is best differentiated from similar species by microscopic characters including spores measuring 5.5-7.0 x 3-4 microns, and thin-walled apically incrusted cystidia (which may be rare). The description is derived from Gilbertson(1) except where noted.
Oxyporus latemarginatus has been found in BC, WA, OR, AB, NS, AR, AZ, CA, FL, LA, MD, MS, MT, NC, NY, and VA, (Gilbertson).
Cap: growing flat on wood, "rather soft when fresh, becoming firm and corky or brittle when dried, readily separable"; margin usually sterile, up to 0.1cm wide, white, fimbriate [fringed]
Flesh: up to 0.1cm thick, soft-fibrous; white to ivory, not zoned
Pores: 1-3 per mm, angular, with walls quickly becoming thin and torn; white to ivory, drying white to cream; tube layer up to 0.7cm thick, colored as flesh and continuous with it
Microscopic: spores 5.5-7 x 3-4 microns, narrowly elliptic, smooth, inamyloid, colorless; basidia 4-spored, 16-20 x 5-7 microns, clavate, simple-septate at base; cystidia rare to frequent or in some specimens apparently absent, 20-28 x 4.5-6 microns, narrowly clavate to cylindric, apically incrusted, simple-septate at base; hyphae monomitic, hyphae of subiculum 3-8 microns wide, colorless in KOH, thin-walled, often branched, simple-septate, hyphae of trama similar
Spore Deposit: white (Buczacki)
Habitat / Range
annual, on dead wood of hardwoods and also in living oaks, causing white rot of dead hardwoods, "also in living oaks, particularly following fire", (Gilbertson), fall, winter, (Buczacki)
Similar Species
Oxyporus similis has smaller pores and spores, (Gilbertson); Oxyporus corticola differs in its narrower hyphae and gloeocystidia, (Gilbertson).
