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Species Information
Summary: Distinctive features include a yellowish to olivaceous pore surface and a dark gelatinous line between the gelatinous tube layer and the upper subiculum. Other features include flat growth on hardwood especially aspen, a white to cream floccose fringed margin, a slightly bitter taste, small allantoid spores, and fusiform cystidia. The online Species Fungorum, accessed October 25, 2015 and August 29, 2020, listed the current name as Gloeoporus pannocinctus (Romell) J. Erikss., on the latter date in the family Irpicaceae. The description derived from Gilbertson(1).
Gloeoporus pannocinctus has been found in BC, ID, AB, MB, NWT, ON, AZ, CO, MA, MD, MI, MN, MT, NH, NM, NY, TN, UT, VA, and VT (Gilbertson). It apparently occurs throughout the range of aspen in North America (Gilbertson).
Cap: growing flat on wood with pore surface exposed, becoming widely spread out, "soft and cheesy when fresh, drying brittle, readily separable", annual; sterile margin up to 0.4cm wide, white to cream, soft, floccose, fimbriate (fringed)
Flesh: subiculum up to 0.25cm thick, soft; whitish, with a distinct darker resinous layer near the tubes
Pores: 6-8 per mm, circular to angular; ivory to lemon yellow or olivaceous; showing a change in appearance from dull to lustrous when the orientation of the pore surface in regard to incident light is changed, surface smooth; tube layer distinct from flesh, tube layer up to 0.25cm thick, pale yellowish or greenish
Taste: slightly bitter
Microscopic: spores 3.5-4.5 x 0.7-1.0 microns, allantoid [curved sausage-shaped], smooth, inamyloid, colorless; basidia 4-spored, 11-18 x 3-4.5 microns, clavate, with basal clamp; cystidia 17-42 x 3-5.5 microns, fusiform, thin-walled, not incrusted, with basal clamp; hyphal system monomitic: subicular generative hyphae 3-7 microns wide, colorless, "frequently branched, thin-walled, with abundant clamps", tramal hyphae similar, "dark layer at base of tubes appearing as a region of more compactly arranged, tightly interwoven hyphae", (Gilbertson), cystidia may be lacking in some fruitbodies (Ginns(28))
Spore Deposit: white (Buczacki)
Habitat / Range
annual, on dead wood of many genera of hardwoods, especially common on aspen, causes white rot, (Gilbertson), fall, winter, spring, (Buczacki)
Similar Species
Vitreoporus dichrous may have caps, and it pore surface is pale reddish gray then pale purplish brown, with round to angular pores 4-7 per millimeter, (Ginns). Ceriporiopsis subvermispora has a white to pale cream spores surface with angular pores 2-4 per millimeter, (Ginns)
