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Species Information
Summary: Oxyporus corticola forms a whitish pore layer growing flat on hardwoods and conifers, best differentiated from similar species by microscopic characters including 2 types of cystidia.
Oxyporus corticola has been found in BC, WA, OR, ID, AB, NF, NS, ON, SK, AR, AK, AL, AZ, CO, FL, LA, MD, MN, MO, MS, MT, NC, NM, NY, SC, TX, VA, and WV, and it occurs circumglobally, (Gilbertson).
Cap: up to 12cm, flat on wood, soft and leathery when fresh, drying friable; margin up to 0.7cm, "fertile, or sterile and then whitish to cream colored, soft, fimbriate", (Gilbertson), consisting of a simple layer of tubes, cap sometimes present as a free margin, (Arora)
Flesh: up to 0.1cm, soft-fibrous; ivory, not zoned, (Gilbertson), thin, fibrous but rather soft when fresh; white, (Arora)
Pores: 2-4 per mm, circular to angular, walls quickly becoming thin and deeply torn; cream to pale tan; tube layer up to 0.3cm thick, colored as flesh and continuous with it, (Gilbertson), 1-4 per mm, white or creamy, discoloring to pale tan when old or upon drying; tube layer 0.3-1cm thick, rather soft when fresh, drying rigid and tough, (Arora)
Taste: mild (Gilbertson)
Microscopic: spores 5-9 x 3.5-4.5 microns, oval to broadly elliptic, smooth, inamyloid, colorless, spores often glued together; basidia 4-spored, 15-18 x 5-7 microns, clavate, simple-septate at base; cystidia of two types: 1) frequent to rare, not or barely projecting from hymenium, 17-30 x 3-6 microns, cylindric, capitately incrusted, simple-septate at base, 2) gloeocystidia often projecting beyond hymenium, 33-45 x 6-10 microns, cylindric to fusiform, "thin-walled, with refractive contents, arising in subhymenium"; hyphae monomitic, hyphae of subiculum 2-5 microns wide, colorless, simple-septate, thin-walled to very thick-walled, often incrusted, hyphae of trama similar, (Gilbertson), spores 5-8 x 3-5 microns, broadly elliptic, smooth, (Arora)
Spore Deposit: white (Arora)
Habitat / Range
annual or sometimes perennial, on dead wood of hardwoods and conifers, causing a white rot, (Gilbertson), single or more often in rows or fused masses on rotting hardwood logs and branches, less commonly on conifers, producing a white rot, (Arora)
Similar Species
Oxyporus similis has smaller spores and smaller pores, and one type of cystidia, (Gilbertson). Oxyporus cuneatus is found almost entirely on Western Red-cedar and usually has a definite cap, (Gilbertson). Oxyporus latemarginatus has wider hyphae, lacks gloeocystidia, and grows only on hardwoods, (Gilbertson). Oxyporus populinus is perennial with a cap, and fruits on live hardwoods with fruitbodies on stem cankers, (Ginns(28)). See also SIMILAR section of Ceriporiopsis aneirina.
