Summary: Features include 1) flat growth on wood with the pore surface exposed, 2) soft texture when fresh, 3) a pale yellow pore surface, 4) rhizomorphs that are often present, 5) small nearly round spores, and 6) a monomitic hyphal system. The online Species Fungorum, accessed October 25, 2015, gave the current name as Ceriporiopsis mucida (Pers.) Gilb. & Ryvarden. The description is derived from Gilbertson(1) except where noted.
Microscopic: spores 2.5-3.5(4) x 2-2.5 microns, broadly elliptic to nearly round, smooth, inamyloid, colorless; basidia 4-spored, 10-12 x 4-6 microns, clavate; cystidia none; hyphal system monomitic, generative hyphae 2.5-4 microns wide, "with clamps, smooth or with small crystals, especially in the margin and the subiculum"
Notes: Porpomyces mucidus has been found in BC, WA, OR, ID, ON, AK, AR, CO, FL, MT, NY, and VA (Gilbertson). It is common in Europe, and circumpolar in distribution (Gilbertson), so presumably also found in Asia.
Habitat and Range
SIMILAR SPECIES
Anomoloma myceliosum is morphologically similar but has spores with amyloid walls (Ginns).
Habitat
annual, on rotten wood of hardwoods and conifers, causing a white rot