Marasmiellus vaillantii (Pers: Fr.) Sing. Syn. Marasmius calopus (Pers. ex Fr.) Fr. Rauber Schwindling. Cap 0.5–1.5cm across, centrally depressed, whitish with rusty-brown tinge at centre, surface uneven. Stem 10–30 x 1–2mm, rusty-brown. Flesh thin, concolorous. Gills distant, white to cream. Cheilocystidia hair-like with irregular knobbly swellings. Spore print white. Spores tear-shaped, 7–8.5 x 3–4.5um. Cap cuticle of irregularly branched hyphae. Habitat on leaf litter, dead grass and other debris. Season autumn. Uncommon. Not edible. Found In Europe.