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Species Information
Summary: Features include bracket-like yellowish brown fruitbodies on living and dead hardwoods, small dark purplish red-brown pores, and microscopic characters including setae. Wagner(1) transferred this species to Fuscoporia gilva (Schw.: Fr.) T. Wagner & M. Fischer on the basis of molecular and other work.
It has been found in BC (Ginns(28)), and WA, OR, ID, MB, ON, AL, AR, AZ, CA, CT, DE, FL, GA, IA, IL, IN, KS, KY, LA, MD, MI, MN, MO, MS, MT, NC, ND, NE, NJ, NM, NY, OH, OK, PA, SC, TN, TX, VA, VT, WI, and WV, (Gilbertson).
Cap: 2.5-15cm broad and 1-3cm thick, shelf-like or bracket-like, fan-shaped or semicircular; bright rusty yellow to ochraceous when young or on growing margin, dark rusty brown and finally blackish when old; at first velvety, "becoming rough to nearly smooth and/or somewhat zoned", (Arora), up to 7cm x 12cm x 3cm, sessile to slightly effused-reflexed [bracket-like to shelf-like], single or imbricate [shingled], dimidiate [roughly semicircular]; dark yellowish brown; zoned or not zoned, tomentose to bald, often rugose [wrinkled], (Gilbertson)
Flesh: tough, corky; bright ochraceous to dark yellow brown or colored like cap, (Arora), up to 2cm thick, fibrous, zoned; bright yellowish brown, (Gilbertson)
Pores: 4-8 per mm, grayish brown becoming reddish brown or dark brown; 1-5 tube layers, each 0.1-0.5cm thick, (Arora), 6-8 per mm, circular, thick-walled; dark purplish brown; tube layer up to 1cm thick, white-stuffed, but tramal tissue colored as flesh and continuous with it, (Gilbertson)
Chemical Reactions: cap tissue blackening in KOH (Arora)
Microscopic: spores 4-5 x 3-3.5 microns, elliptic to oval, smooth, inamyloid, colorless; basidia 4-spored, 5-11 x 5-7 microns, broadly clavate, simple-septate at base; setae abundant, 20-30 x 5-6 microns, subulate [awl-shaped], sharp, dark brown in KOH, thick-walled; hyphae of context of 2 types: 1) 3-7 microns wide, "dark reddish brown in KOH, thick-walled, rarely branched, simple-septate", 2) 3-5 microns wide, "pale yellowish brown, thin-walled, with occasional branching, simple-septate"; hyphae of trama similar, (Gilbertson), spores 4-5 x 2.5-3.5 microns, oblong-elliptic, smooth, rarely found, (Arora)
Spore Deposit: whitish (Arora)
Habitat / Range
often perennial, single or more often in groups on dead or occasionally living hardwoods, producing a general delignifying decay of sapwood, making it whitish and brittle; rarely on conifers, (Arora), perennial or annual, on living and dead hardwoods, especially oak, rarely on conifers, associated with a uniform white rot of dead wood of hardwoods and a heart rot of living trees, (Gilbertson)
