Summary:
Bright orange fruitbodies growing flat on wood are distinctive in the field. Other features include often patchy development of pores over a large area of sterile pinkish buff mycelium, the orange pore areas becoming dark reddish brown on drying, small size of pores, and microscopic characters. The description is derived from Gilbertson(1) except where indicated.

Microscopic:
spores 4-6 x 1.5-2 microns, allantoid [curved sausage-shaped], smooth, inamyloid, colorless; basidia 4-spored, 12-24 x 5-6 microns, clavate, some appearing refractive in KOH, simple-septate at base; cystidia none; hyphal system monomitic: subicular hyphae 2-3.5 microns wide, colorless, "thin-walled, simple-septate, with frequent branching", "some partially encrusted with an amorphous, yellowish gummy material", tramal hyphae "similar but parallel, very compactly arranged and difficult to separate, moderately thick-walled"

Spore Deposit:
white (Lincoff)

Notes:
Ceriporia spissa has been found in BC (Ginns(28)), and WA, OR, ID, AL, AZ, CA, DE, IA, IN, KY, MA, MN, MO, NC, NY, PA, SC, TN, VA, and WV, (Gilbertson).

Synonyms and Alternate Names:
Ascobolus furfuraceus Pers. Neues Mag.