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).

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)

Notes:
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).

Synonyms and Alternate Names:
Hypomyces insignis Berk. & M.A. Curtis
Hypomyces purpureus Peck