Marasmius buxi

General: Host-specific on decaying fallen leaves of box (Buxus sempervirens), pileus 1-3.5 mm diam., convex to centrally flattened, reddish-brown at the disc with a whitish margin, pulverulent to granulose, stipe up to 2 cm long, 0.2-0.3 mm thick, blackish.

Pileipellis: Composed of vesiculose to pyriform broom-cells, thick-walled, 10-25 x 7-15 µm, ornamented with abundant short digitations and brown intracellular pigment.

Cheilocystidia: Abundant, fusiform, mucronate at the apex, 18-30 x 4-8 µm, with clamped bases.

Basidia: Cylindric-clavate, 20-25 x 6-8 µm, with basal clamp connections, 1- or 2-spored (mono- or bisporic).

Spores: Cylindrical to fusiform, pointed at the apicular pole, smooth, hyaline, thin-walled, 7.5-10 x 3-4.5 µm, containing oil droplets.