Hypholoma myosotis, also known as the Olive Brownie, is a small brownish agaric typically with a convex to flattened olive-brown cap. Its gills are olive-coloured, and the slender stem is whitish with a powdery coating towards the top, often extending deep into the substrate. This saprotrophic species is found growing in groups during summer and autumn, from June to November, favouring moss-rich peat bogs and mixed or broadleaf beech forests, though it may also occur in other damp habitats.

Cap at first convex, later flattening and often slightly raised in the centre. The surface is smooth, bare and conspicuously slimy. Initially olive or olive-brown, it later fades to light brown or yellowish-olive. The margin is scarcely striate and often decorated with scattered white flakes. Gills ventricose, spaced and adnate. They are greyish-yellow, light brown or olive-brown, becoming rusty brown with age. The edge is white and serrated. Stem rather elongated, slender and rigid. It is yellowish, light brown or reddish-brown, whitish at the top, with white fibrous patches resembling snakeskin. Spore print rusty brown.

Microscopic Features: The spores are elliptical, almond-shaped, elongated, smooth, with a small germ pore, 14–19 × 7–9 µm.