Summary:
Features include 1) resupinate growth on hardwood species of trees and bushes, 2) fruitbodies that are hard; brownish to grayish often with a reddish or lilac tint; smooth, granulose, or bumpy; and cracked, 3) fine bristles visible on the surface under hand lens, 4) spores that are cylindric, smooth, inamyloid, and colorless, 5) the fruitbody consisting of 2-3 layers: a) a hymenium (outer layer) of basidia and setae (hyphidia and cystidia absent), b) a context consisting of a setal layer of overlapping rows of setae 35-80(100) x (6)7-15(17) microns, projecting to 50(60) microns above hymenium, the upper part of each encrusted or rugose, c) a thin dense cortex-like hyphal layer that may be present (but tomentum and true cortex absent).

Microscopic:
SPORES 4.5-6 x 1.8-2.3 microns, "cylindric-elliptic, somewhat curved at the apiculus, smooth", inamyloid, colorless; BASIDIA 4-spored, 10-15 x 2.5-4 microns, narrowly clavate, without basal clamp connection; CYSTIDIA none; SETAE 40-70 x 6-10 microns, thick-walled, subulate [awl-shaped] "with obtuse, usually pale and finely incrusted tips, dark brown, both exserted beyond the hymenium and enclosed in the trama"; HYPHAE monomitic up to 3.5 microns wide, "densely interwoven and difficult to see", thin-walled to thick-walled, colorless to brownish, without clamp connections, (Breitenbach), SPORES 4.5-6.8(7) x 1.5-2.3 microns, cylindric, slightly curved; fruitbody consists of 2-3 layers: 1) hymenium of basidia and setae (hyphidia and cystidia absent), 2) context consisting of setal layer, 3) thin dense cortex-like hyphal layer may be present (tomentum and true cortex absent, no dark line representing cortex); BASIDIA 4-spored, 15-22 x 3.5-4 5 microns, clavate or subclavate, sterigmata 4-5 microns long; SETAL LAYER 200-550 microns thick, of overlapping rows of setae, setae numerous, 35-80(100) x (6)7-15(17) microns, projecting to 50(60) microns above hymenium, conic to almost fusiform, "at base surrounded with a node of agglutinated hyphae, with blunt or almost acute easily broken tip, straight, naked, in upper part always encrusted with scattered amorphous granules or rugose"; CONTEXT HYPHAE compactly agglutinated, erect, or interwoven; BASAL HYPHAL LAYER 10-40 microns thick; HYPHAE monomitic, setal hyphae absent, generative hyphae 2.2-4.2 microns wide, "brownish to brown, thick-walled, septate, branched"; "in context and hymenium crystalline matter absent", (Parmasto)

Notes:
Hymenochaete corrugata has been found in WA, ID, MB, NB, NS, ON, PE, PQ, AL, AR, AZ, CT, DC, DE, FL, GA, HI, IL, IN, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, NH, NJ, NY, OH, PA, RI, SC, TN, TX, VA, VT, WI, WV, Costa Rica, Jamaica, Puerto Rico, Argentina, Brazil, Ecuador, Uruguay, Austria, Belgium, France, Germany, Italy, Switzerland, Ukraine, United Kingdom, Tunisia, Southern Africa, China, Japan, Russia (Siberia), Taiwan, and New Zealand, (Parmasto). There are 3 collections from BC at the University of British Columbia.

Synonyms and Alternate Names:
Corticium rude P. Karst.
Fibricium greschikii (Bres.) J. Erikss.