Summary:
Features include 1) resupinate growth on rotting wood and bark, 2) a bright to dingy red fruitbody, sometimes with a whitish bloom, the surface tuberculate-wrinkled, and the margin orange when young, 3) spores that are elliptic, smooth, and inamyloid, 4) subfusoid cystidia that are projecting, and develop a yellow encrustation on the distal conic part, and 5) a monomitic hyphal system, the hyphae with clamp connections, forming 2 layers: encrusted vertically oriented hyphae making a yellow-brown layer next to the hymenium, and horizontally oriented hyphae making a bright orange yellow subicular layer. The Eriksson(6) description used here is for Phlebia martiana (Berk. & M.A. Curtis) Parmasto, which is given by Ginns(5) as a synonym of Phlebia coccineofulva Schwein. The Cooke(4) description here is for Phlebia atkinsoniana W.B. Cooke which is given by Eriksson(6) as a synonym of Phlebia martiana.

Microscopic:
SPORES 4-5(6) x 2.5-3.5 microns, elliptic, smooth, inamyloid, acyanophilic, thin-walled; BASIDIA 4-spored, 20-30 x 4-6 microns, narrowly clavate, with basal clamp connection; CYSTIDIA numerous, "at first thin-walled and naked, then in the distal conical part with a yellow, crystalline encrustation", total length 50-60 microns, encrusted part 30-40 microns, greatest width 8-12 microns; HYPHAE monomitic, 2-3 microns wide, conglutinate, with clamp connections, vertical hyphae with a grainy-resinous encrustation, "giving the layer a dark brown color, yellow-brown under the microscope"; "subiculum bright orange-yellow, turning vinaceous red in KOH, composed of dense, horizontal hyphae", (Eriksson), SPORES 3-5 x 2.5-3 microns, oboval to subelliptic, smooth, "white, hyaline"; BASIDIA 4-spored, "slender, cylindric, clavate"; CYSTIDIA 60-75 x 10-12 microns, projecting 15-25 microns above hymenium, subfusoid, roughened when old, "thick-walled, at first whitish but with a pale orange content, later becoming sordid", (Cooke)

Notes:
Phlebia coccineofulva has been found in BC, ID, NB, ON, PQ, AL, AZ, CA, CO, FL, MA, ME, MD, MI, NH, NJ, NY, OH, PA, WI, and WV, (Ginns).

Synonyms and Alternate Names:
Corticium martianum Berk. & M.A. Curtis
Peniophora coccineofulva (Schwein.) Burt
Peniophora martiana (Berk. & M.A. Curtis) Burt
Phlebia atkinsoniana .B. Cooke
Phlebia martiana (Berk. & M.A. Curtis) Parmasto
Polyporus bombycinus Fr.
Poria fulvella Bres.