Summary: Features include 1) resupinate growth on wood, 2) a light yellowish buff fruitbody with teeth 0.1-0.4cm long, or sometimes varying to smooth, 3) subcylindric to subfusiform spores, 4) urniform basidia that are usually 6-8 spored, and 5) a monomitic hyphal system, the hyphae with clamp connections and oily inclusions.
Microscopic: SPORES (6)7-9 x (2.5)3-3.5 microns, subcylindric to subfusiform, "apically obtuse, often broader below the middle, thin-walled, often clinging together in groups of 4-6"; BASIDIA (4)6-8-spored, 18-23 x 5-7 microns, urniform, with basal clamp connection; CYSTIDIA none; HYPHAE monomitic, "with clamps and oily inclusions", SUBHYMENIAL HYPHAE 2-3 microns wide, thin-walled, richly branched, BASAL HYPHAE "and those of the central part of the aculei 2-6 microns wide, with somewhat thickened walls, straight and sparsely branched", (Eriksson)
Notes: Sistotrema raduloides has been found in BC, WA, OR, AB, NB, NS, NT, ON, PQ, AK, AZ, CO, IA, MI, MN, MT, NC, NY, TN, and WI, (Ginns), as well as Estonia, Finland, Norway, Poland, and Sweden, (Eriksson).
Habitat and Range
Habitat
on very decayed wood of hardwoods with a preference for Populus tremula [European Aspen] but also on other hardwoods (e.g. Betula, Quercus, Malus), rarely on coniferous wood (Picea), seen from North America on Populus spp. and coniferous wood, (Eriksson), on bark; decayed barkless wood; logs; associated with a white rot; Abies (fir), Acer (maple), Betula (birch), Picea (spruce), Populus, Tilia (basswood), Tsuga (hemlock), (Ginns)