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.

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)

Notes:
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).

Synonyms and Alternate Names:
Hydnellum scrobiculatum var. zonatum (Batsch) K.A. Harrison
Hydnellum zonatum (Batsch) P. Karst.