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.
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).
Cap:
flat on wood with pore surface exposed, margin usual sterile, pores usually patchy over large area of sterile mycelium, sterile area being pinkish buff and minutely tomentose, (Gilbertson), orange pore area with matted hairy yellowish-brown margin, (Lincoff)
Flesh:
subiculum less than 0.1cm thick, soft; pinkish buff, (Gilbertson), flesh 0.3-0.5cm thick, thin, spongy to firm; white to pale brownish, (Lincoff)
Pores:
7-9 per mm, "orange when fresh, darkening to reddish brown on drying"; tube layer up to 0.1cm thick, cheesy, "orange when fresh and dark reddish brown on drying", (Gilbertson), 6-8 per mm, round to angular; brilliant orange, bruising or drying dark brownish-red, (Lincoff)
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)
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