Although primarily known from Europe, several collections have been identified in North America; here are a few from Indiana and New York at iNaturalist. Found in July. Spermatic odor. Caps 3-4 cm. Identified at MycoMap through DNA sequencing.
Basidiomes gregarious; pileus broadly conical,
campanulate, expanded to broadly convex, 25–35(–40)
mm, with a broad and low umbo; margin involute when
young, then decurved to straight upon expansion;
initially regular, then somewhat wavy to irregular in old
specimens; pale yellowish, ochraceous to brownish
yellow, orange-yellow or reddish yellow; surface woollyfibrillose to felty; sometimes becoming glabrous towards
the centre; lubricous and sticky; with adhered leaves
and soil; whitish velipellis present in young fruiting
bodies. Lamellae whitish, beige or pale grey, brownish
grey or ochre-brown; ventricose to subventricose,
nearly free or adnexed, moderately crowded (L = 40–
55, l = 1–3); edge crenulate. Stipe whitish to cream
color, sometimes light yellow tinges, sometimes
covered with fibrils at the lower part, 30–50 × 3–5 mm,
solid, smooth, cylindrical or slightly curved; base
marginately bulbous. Context firm and whitish; smell
spermatic when cut; taste mild. Basidiospores
heterodiametric-nodulose, 7.4–10.2 × 4.5–6.5 μm, on
average 8.7 × 5 μm, Q = 1.5–1.75 [n = 50], without germ
pore. Basidia 25–35 × 8.5–10.5 μm, clavate, 4-spored;
Pleurocystidia abundant to scattered, metuloid,
ventricose (sub)fusiform or subutriform with broad and
short neck, 45–58 × 15–22 μm [n = 20]. Cheilocystidia
similar to pleurocystidia, 35–60 × 15–20 μm [n = 20].
Hymenophoral trama regular, cylindrical to fusiform
parallel with 3-16 μm wide hyphae. Pileipellis consists
of an gelatinized, 3–5 μm wide parallel hyphae. Clamp
connections present in all tissues.
Source: The Journal of Fungus
Microscopic Features of Inocybe nothomixtilis
See also: Inocybe Mushrooms at Indiana Mushrooms