Summary:
Features include flat growth on wood with the ivory yellowish or tan pore surface exposed, a soft whitish margin up to 0.2cm wide, firm attachment, tough consistency, distinctly stratified tube layers, black flecks in the rotted wood, and microscopic characters including broadly elliptic, non-truncate spores, slender branched dextrinoid binding hyphae and wider, dextrinoid, rarely branched skeletal hyphae.

Taste:
mild or slightly acid (Gilbertson)

Microscopic:
spores 4.5-7.5 x 3-5 microns, oval to broadly elliptic, smooth, inamyloid, colorless, thin-walled, distinctly apiculate, usually with a single droplet; basidia 4-spored, 20-40 x 5.5-8.5 microns, clavate, with basal clamp, some basidia with narrowed base; cystidia none, cystidioles embedded or projecting slightly, 13-35 x 4.5-6 microns, fusoid, with basal clamp, some lightly incrusted; hyphal system trimitic: subiculum generative hyphae 2-3 microns wide, thin-walled, with clamp connections, inconspicuous, skeletal hyphae 2.5-7 microns wide, thick-walled, nonseptate, rarely branched, binding hyphae 1-2 microns wide, some branched profusely, nonseptate, trama hyphae similar, skeletal and binding hyphae dextrinoid, (Gilbertson)

Spore Deposit:
white (Phillips)

Notes:
Perenniporia subacida has been found in BC, WA, OR, ID, NB, NF, ON, PQ, AK, AL, AR, AZ, CA, CO, FL, KS, KY, LA, MA, MN, MO, MT, NC, NM, NY, SC, TN, VA, WV, and WY, (Gilbertson).

Synonyms and Alternate Names:
Coriolus versicolor (L.: Fr.) Quel.
Polyporus subacidus Peck
Polyporus versicolor L.: Fr.