Summary:
Features include 1) a reddish brown to blackish bracket-like or shelf-like cap with a yellowish brown pore surface, or the pore surface flat on wood, 2) small pores, 3) tubes that are usually whitish within, 4) perennial growth on hardwoods and conifers, and 5) microscopic characters including narrow cylindric spores and long narrow setae. Gilbertson(1) says that [at least in North America] it occurs most commonly on conifers but also frequently collected on hardwoods in North America, but Ginns(28) says that [at least in western North America] it grows on live and dead hardwoods, rarely on conifers. This has been called Trametes isabellina Fr., and the flat form has been called Poria isabellina Overh.
Fuscoporia viticola has been found in BC, WA, OR, ID, AB, MB, NB, NF, NS, ON, PE, YT, AK, AZ, CA, CO, CT, FL, IL, KY, MA, MD, ME, MI, MN, MO, MT, NC, ND, NH, NM, NY, OH, PA, SD, TN, UT, VA, WV, and WY, and occurs circumglobally, (Gilbertson). It also occurs in Europe (Breitenbach).
Cap:
usually bent outwards from pore surface flat on wood, to form shelf-like cap, often bracket-like or entirely flat on wood, flat pore surfaces extending up to 30cm, caps generally dimidiate [roughly semicircular] or narrow shelf-like, up to 1.5cm x 6cm x 1cm, reddish brown to blackish; hirsute [hairy] to almost bald, grooved; "margin usually lighter reddish brown, tomentose to hirsute, acute or rounded", (Gilbertson), 1.5-8cm along wood, projecting 1-3cm outward, 0.5-1.5cm thick at attachment, "semicircular to elongated and bracketlike", broadly attached, (sometimes entirely flat on wood with pore surface exposed), "corky and tough when fresh, woody and hard when dry"; upper surface dark rust brown to gray-brown; "undulating and with narrow concentric zones, rough, appressed-tomentose"; margin thin, sharp, slightly wavy, "somewhat lighter to yellow brown", (Breitenbach)
Flesh:
up to 0.3cm thick, corky-fibrous; faintly zoned, yellowish brown, (Gilbertson)
Pores:
4-7 per mm, circular to angular, thick-walled, yellowish brown; tube layers up to 0.5cm thick, colored as flesh and continuous with it, "the tubes usually whitish within", (Gilbertson), 3-4(5) per mm, rounded-angular; gray-brown, cinnamon-brown; tube layer 0.1-0.7cm thick ("tube length 1-7 mm"), layered, (Breitenbach)
Microscopic:
spores 5.5-8 x 1.5-2 microns, cylindric, straight or curved, smooth, inamyloid, colorless, frequently with 2 droplets; basidia 4-spored, 9-10 x 5-6 microns, clavate, simple-septate at base; setae abundant, 25-75 x 5-8 microns, narrowly subulate [awl-shaped], thick-walled; hyphae of context of 2 types: 1) 2-3 microns wide, "brown in KOH, thick-walled, rarely simple-septate", 2) 2-3 microns wide, pale yellowish brown to colorless in KOH, "thin-walled, with occasional branching, simple-septate"; hyphae of trama similar, (Gilbertson), spores 6-8 x 1.5-2 microns, cylindric, allantoid, smooth, inamyloid, colorless; setae 40-60 x 5-8 microns, pointed, brown, thick-walled, exserted far beyond hymenium, (Breitenbach)
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