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Species Information
Summary: Features include flat growth on wood with the pore surface exposed, a pore surface that is variable in color (mostly cream to cinnamon or sordid brown with a greenish tint, more rarely pinkish sordid white), pores that are round to wavy, a narrow white margin, growth usually on hardwood, and microscopic characters.
Ceriporia viridans has been found in BC, WA, OR, ID, AB, MB, AK, AL, AZ, CA, IA, KY, LA, MN, MT, NM, and NY, (Gilbertson). It also occurs in Europe and Asia (Breitenbach).
Cap: growing flat on wood with pore surface exposed, up to 0.3cm thick, "soft when fresh, fragile when dried, margin narrow and white", (Gilbertson), growing flat on wood, tightly attached, forming "waxy-soft, porose patches several centimeters in extent", patches hard and brittle when dry; margin "reticulate-porose on a whitish subiculum when young, then distinctly bounded", (Breitenbach)
Flesh: subiculum up to 0.1cm thick, white to cinnamon in old specimens, (Gilbertson)
Pores: 3-5 per mm, round to sinuous (wavy), "in some specimens larger or more irregular"; color variable, "mostly cream to cinnamon or sordid brown with a greenish tint, more rarely pinkish sordid white", (Gilbertson), 3-5(6) pores per mm, "rounded to somewhat angular", also oblong on vertical surfaces; white to cream, faintly spotting pink-violet, not discoloring when bruised, ocherish when dry (according to literature can become greenish to purple when dry); tube layer 0.1-0.2cm thick, (Breitenbach)
Microscopic: spores 4-6 x 1.5-2 microns, cylindric to allantoid [curved sausage-shaped], inamyloid, colorless; basidia 4-spored, 12-15 x 4-6 microns, clavate, simple septate at base; cystidia none; hyphal system monomitic: "generative hyphae with simple septa, richly branched, often at right angles, 2-4 microns wide in the trama, up to 10 microns wide and more thick-walled in the subiculum and margin", (Gilbertson), spores 3.4-5 x 1.5-2 microns, cylindric, slightly curved, smooth, inamyloid, colorless, (Breitenbach)
Spore Deposit: white (Buczacki)
Habitat / Range
annual, on hardwood, more rarely on conifer wood, mostly on rather rotten wood, causing white rot in hardwoods, (Gilbertson), summer to fall (Buczacki)
Similar Species
Ceriporia viridans is presumed to be a synonym of Ceriporia excelsa with its pores of variable color, by some authors: in its typical form C. viridans "is supposed to be greenish when dry and to have spores less than 2 microns wide" and has smaller pores that do not discolor when bruised, (Breitenbach who also observed that the initial stage was "reticulate-porose in C. viridans and bowl-shaped in C. excelsa")
