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Species Information
Summary: Features include 1) flat growth on wood with the pore surface exposed, 2) an ocher-whitish to pink to reddish orange or violet pore surface (quickly turning pink when handled), that starts development with isolated crater-like cups, 3) a narrow margin that is white to pinkish tan or purplish and webby or floccose, and 4) microscopic characters including large hyphae with whorled branching and occasional clamp connections.
Ceriporia excelsa has been found in BC, WA, OR, AK, AZ, CA, MN, MT, NM, and NY, (Gilbertson). It is also found in Europe and Asia, (Breitenbach).
Cap: growing flat on wood with pore surface exposed, soft, separable, margin narrow, white to pinkish tan or purplish, arachnoid [webby] or floccose, (Gilbertson), growing flat on wood, tightly attached, forming thin pored patches with soft cottony consistency several centimeters in extent; marginal zone "cottony-floccose and without pores when young", later distinctly bounded and pored, (Breitenbach)
Flesh: subiculum up to 0.1cm thick, soft; white or pinkish to tan, not zoned, (Gilbertson)
Pores: 2-3 per mm, circular to angular; typically pink to reddish orange but variable to grayish-white; dull; thick walls that become thin and torn when old; the tubes forming as isolated shallow cup-shaped depressions, later fusing; tube layer up to 0.05cm thick, colored as subiculum (white or pinkish to tan), (Gilbertson), isolated "small crateriform cups with a fringed margin", 0.15-0.2 mm across, develop on tomentose-cottony base, and later coalesce "to form continuous pore layer, 1-3 pores per mm, rounded to angular"; "ocherish-whitish with pink places when young, quickly turning pink when handled, entire fruiting body lilac-pink to violet when older", (Breitenbach)
Microscopic: spores 3.5-5 x 1.5-2 microns, oblong to short-cylindric, smooth, inamyloid, colorless; basidia 4-spored, 14-16 x 4-6 microns, clavate, simple-septate at base; cystidia none; hyphal system monomitic, subicular hyphae 5-15 microns wide, colorless, thin-walled to slightly thick-walled, "mostly simple-septate, slightly swollen at the septa and frequently with whorled branching, rarely with single, double, or multiple clamps", tramal hyphae 3-4.5 microns wide, simple septate, (Gilbertson), 3.5-4.5 x 2-2.5 microns, elliptic to cylindric, sometimes slightly curved, smooth, inamyloid, colorless, with or without droplets, (Breitenbach)
Spore Deposit: white (Buczacki)
Habitat / Range
annual, growing on dead hardwoods, rarely on conifers, causing a white rot, (Gilbertson), on the underside of dead conifers and hardwoods, (Breitenbach), fall (Buczacki)
Similar Species
Ceriporia viridans is "presumed to be a synonym by some authors, in its typical form 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"). Porothelium fimbriatum is reminiscent because of development from isolated pores, (Breitenbach). See also SIMILAR section of Ceriporia purpurea, Ceriporia reticulata, and Porotheleum fimbriatum.
