Summary:
Features include 1) form that is flat with the pore surface exposed, or bent back to form a cap, or with stemless cap, 2) a purple pore surface, and 3) spores that are allantoid and 5-7 microns long.

Chemical Reactions:
pore surface turns purple-violet when dabbed with KOH, (Breitenbach)

Microscopic:
spores 5-6 x 2-2.5 microns (some specimens have spores up to 9 microns long), allantoid [curved sausage-shaped], smooth, inamyloid, colorless; basidia 4-spored, 18-23 x 4-6 microns, clavate, simple-septate at base; hyphoid sterile elements on edges or tubes or folds and projecting up to 50 microns, 3-6 microns wide, cylindric, occasionally septate; hyphal system monomitic, subicular hyphae 1-6 microns wide, some lightly incrusted, colorless in KOH, simple septate, thin-walled to moderately thick-walled, with frequent branching, (Gilbertson), spores 6-7 x 2-2.3 microns, cylindric, allantoid, smooth, inamyloid, colorless, some with droplets, (Breitenbach)

Notes:
Ceriporia purpurea has been found in BC, WA, OR, ID, AB, AZ, CA, CO, MT, NM, NV, and NY, (Gilbertson) and SK (Ginns). It also occurs in Europe, Asia, and Africa, (Breitenbach).

Synonyms and Alternate Names:
Poria purpurea Fr.) Cooke