Summary:
Distinctive features are 1) small size, 2) a cup-shaped, bald to pruinose, striate cap that is beige, pinkish brown, gray-brown, to blackish, 3) gills radiating from the point of the stemless attachment that are buffy, pinkish-buff or brown with pale edges, the margin often translucent-striate, 4) growth on the underside of logs, 5) a white spore deposit, and 6) microscopic characters. Resupinatus striatulus is "confused in the literature with R. applicatus": for instance the majority of the collections of the two species examined in Ontario were R. striatulus, (Thorn(2)).
Resupinatus striatulus was examined from BC, MB, NB, ON, QC, NY, Germany, and the United Kingdom, and is "Probably widespread in Europe and North America", (Thorn(2)). There is a collection from MT at the University of Washington.
Cap:
0.15-0.7cm, cupulate [cup-shaped], dorsally or laterally attached; beige, pinkish brown, gray-brown, to blackish, darkening on drying; appears moist and polished when water-soaked, finely pruinose overall, or margin bald, margin translucent-striate or not, sometimes faintly sulcate [grooved], edge entire or crisped [wavy]
Gills:
"radiating from point of attachment or a central or eccentric point on underside", subdistant, moderately narrow to moderately broad; colored as cap or slightly paler, buffy, pinkish-buff, or brown, edges paler; edges entire, surface bald or atomate [with tiny shiny particles]
Stem:
absent
Microscopic spores:
spores (3.3)4.0-6.0 x (3.1)3.5-5.0 microns, round or nearly round, inamyloid, colorless; basidia 4-spored, 20-27 x 5.5-7 microns, clavate; cheilocystidia a dense fringe on gill edges, (10)15-27 x 4-8 microns, projections tapering and needle-like, often tipped with a fine droplet 1.0-1.5 microns in diameter, "and obscured by granular-crystalline yellowish encrusting material"; cap cuticle 10-25 microns deep, "a tangle of brownish hyphae, with many details obscured by heavy encrustations of yellowish granular or crystalline material", hyphae 1.5-5.5 microns wide, "with irregular knobs, branchlets, and pegs in some areas dense and repent, in others with loose ends verging on a trichoderm", gelatinous zone about 100 microns thick in cap margins, to 400 microns thick in center, colorless, "with tangled and ascendant, faintly brownish hyphae", (1.0)1.5-3.0 microns wide, clamp connections to 7 microns diameter; cap trama 45-150 microns thick, "sometimes poorly distinguished from gelatinous zone, but usually more dense, pale brown, then descending into gills" where it becomes more colorless and gelatinized, hyphae 2-6 microns wide, (Thorn); Resupinatus species have distinctive cell surface structure
Spore deposit:
white
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