Summary:
Features include 1) growth on wood, often in buildings, 2) a brown to yellow brown, fleshy, waxy, merulioid fruitbody, typically 0.2cm thick, the margin white to pallid, with a few narrow hyphal strands, 3) spores that are broadly elliptic, smooth, nondextrinoid, yellow, and (sometimes slowly) cyanophilic, 4) context hyphae mostly with clamp connections, and 5) hyphal strands with one or more wide core hyphae surrounded by narrower hyphae.

Microscopic:
SPORES (5)5.6-6.8(8) x 3.6-4.4(5) microns, broadly elliptic, occasionally broadly oval, especially in face view, adaxially flattened, smooth, nondextrinoid, yellow, cyanophilic (but very slow reaction in some specimens, generally taking 10 to 20 hours), wall thickened to 0.6 microns, apiculus 0.6 microns broad, 0.4 microns long and blunt; BASIDIA 4-spored, 20-52 x 6-8 microns, clavate, sterigmata up to 4.8 microns long; cystidia lacking but some CYSTIDIOLES in one collection, 3-4 microns wide, "scarcely projecting with apex papillate, forked or elongated"; TRAMAL HYPHAE 2-3(5) microns wide, woven, frequently branched and septate; CONTEXT hyphae 2-7(18) microns wide, distinct, loosely woven, colorless, thin-walled, "occasionally to frequently branched, with clamp connections and a few simple septa"; HYPHAL STRANDS uncommon, usually next to substrate, 12-25 microns wide, "composed of one or a few core hyphae which are surrounded by narrower (2-7 microns) hyphae", core hyphae 8-18 microns wide, colorless, apparently simple-septate, walls thickened to 1.5 microns, (Ginns(15))

Notes:
Collections were examined from BC, Washington, NS, Alaska, CO, ME, PA, TN, Austria, Denmark, France, Germany, Hungary, Sweden, and the United Kingdom, and it has also been recorded from the USSR, (Ginns(15)). The North American distribution is BC, NS, CO, IN, ME, PA and TN, (Ginns(5), who does not list the Washington and Alaska collections noted above).