Summary:
Features include 1) a dry, smooth to fibrillose cap with creamish-white superficial layer at the disc and light grayish brown color toward the margin (bicolored), 2) adnexed, white gills that become dingy pinkish or grayish brown, 3) a pale flesh-colored or grayish pruinose stem with a distinct marginate bulb, 4) a spermatic odor, and 5) nodulose spores. Inocybe albodisca is likely to be the same species as Inocybe grammata Quel., which name would then have priority.

Cap:
1.5-3.5cm across, convex to broadly conic; "pale brownish flesh-colored or pallid grayish brown, except at the center, which has a persistent creamish-white superficial layer; smooth then a little fibrillose, silky", (Phillips), 1.5-3.5cm across, nearly conic, then bell-shaped - umbonate or expanded, umbo obtuse; at first pale-lilac-incarnate then grayish drab; dry, innately silky, the umbo sublubricous, the margin becoming rimose [cracked], (Kauffman), 1.5-3.5cm across, convex becoming flat with broad umbo; grayish brown to pinkish brown, white to cream at center; "moist, smooth at center, elsewhere becoming minutely fibrous to radially cracked", (Lincoff), white at center, grayish vinaceous or brownish vinaceous at margin, (Stuntz)

Flesh:
pallid or a touch pinkish (Phillips), whitish, unchangeable, (Kauffman)

Gills:
"adnexed; white becoming dingy pinkish brown", (Phillips), sinuate-adnexed, close, rather narrow; whitish at first then cinereous-brown, the edges minutely white-fimbriate [fringed], (Kauffman), "attached, close, narrow"; whitish becoming grayish brown; edges fringed, (Lincoff)

Stem:
3-5cm x 0.3-0.5cm, "with a distinct marginate bulb; pale flesh-colored, lighter at the base when fresh"; becomes pruinose, (Phillips), 3-5cm x 0.3-0.5cm, equal above the subemarginate bulb, solid; tinged with the same color as the cap, fading; bald, pruinose at the top, (Kauffman), 2.5-5cm x 0.3-0.5cm, with bulb, solid; grayish, tinged pinkish at times; minutely white-haired, (Lincoff), with a definite marginate bulb; pink; entirely pruinose, (Stuntz)

Veil:
[no ring]

Odor:
spermatic (Phillips, Lincoff)

Microscopic spores:
spores 6.5-8 x 4.5-6 microns, nodulose; pleurocystidia plentiful, 45-70 x 13-20 microns, wider in middle, thin-walled, encrusted, (Phillips), spores 6-7(8) x 5-6 microns, "sinuate-angular, subrectangular to subglobose in outline, obscurely subnodulose"; pleurocystidia and cheilocystidia abundant, 45-60 x 15-18 microns, subfusoid-ventricose, thick-walled, colorless, sterile cells short, clavate, mixed with the cheilocystidia, (Kauffman), spores 6-8 x 4.5-6 microns, angular-warty, (Lincoff), spores 6.5-8(9) x 4.5-6 microns, angular in outline, with 7 to 9 rather small warts; basidia 4-spored, 20-38 x 8-10 microns; pleurocystidia 46-66 x 13-20 microns, "ventricose above a short, narrow pedicel", with or without a short cylindric neck, colorless, thick-walled (5-6.5 microns), edge of gills with metuloids like the pleurocystidia (50-65 x 14-20 microns), and an abundance of clavate, thin-walled sterile cells (19-35 x 5.5-9 microns); gill trama parallel, compact, composed of cylindric to fusiform or clavate cells 5.5-17 microns in diameter and with fine, granular, colorless incrustation, walls colorless; cap surface a layer 45-90 microns deep of colorless, somewhat agglutinated hyphae 5-10 microns wide, "these with fine granular incrustation and mostly radially oriented and parallel to the surface, but tending to be interwoven here and there"; apex of stem with clusters of cystidia, comprising two or more metuloids 50-70 x 11-20 microns and many thin-walled, clavate sterile cells 22-33 x 8-11 microns, base of stem with similar clusters, the metuloids 52-74 x 8-20 microns, and the clavate cells 11-33 x 8-18 microns, (Grund)

Spore deposit:
snuff brown (Phillips)

Notes:
Kauffman gives the distribution of I. albodisca as New England to MO and WA (Kauffman(4)) and records it from OR (Kauffman(5)). Nishida notes it for CA and Grund for NS. There are collections for BC at the Pacific Forestry Centre and the University of British Columbia. The University of Washington has collections from WA, OR, ID, and AK.

EDIBILITY

poisonous (Lincoff)