Marasmius undatus (Berk.) Fr. (illustrated almost life size) Cap 1–2cm across, convex; dirty white to umber with a white bloom, becoming rust-spotted with age. Stem 50–100×1–2mm; white at apex, reddish-brown towards the base; entirely covered in a fine white velvet, base finely hairy. Flesh white in cap, brownish in stem. Gills white to pale yellowish, becoming rust-spotted. Spores 8–11×6–7¼, almond-shaped. Spore print white. Cheilocystidia and pleurocystidia fusiform, thin-walled. Cuticular cells subglobose, smooth. Habitat on rhizomes and dead stems of bracken; autumn. Uncommon. Not edible toxicity unknown.