Pileus up to 22 x 11 mm when still closed, up to 35 mm when expanded, subglobose to oblong, densely covered with mealy to hairy floccose veil, grey to grey-brown. Lamellae free, white to black. Stipe up to 60(-95) x 1-3 mm, whitish; base somewhat clavate. Smell none or somewhat muddy.
  Spores 9.6-12.7 x 4.7-5.6 µm, Q = 1.75-2.50, av. Q = 1.95-2.30, av. L= 10.6-11.9 µm, av. B = 5.1-5.5 µm, ellipsoid or ovoid, with conical base and rounded to somewhat truncate apex, dark red-brown; germ pore central, 1.4-1.6 µm wide; episporium strongly developed, smooth, up to 2 µm wide in places. Basidia 16-30 x 8-10 µm, 4-spored, surrounded by 3-5 pseudoparaphyses. Pleurocystidia 50-130 x 20-35 µm, utriform, oblong or subcylindric. Cheilocystidia 30-90 x 20-45 µm, (sub)globose, ellipsoid, oblong, utriform or subcylindric. Pileipellis made up hyphoid elements. Elements of veil up to 70 µm wide, made up of globose, warty cells connected with narrow, diverticulate hyphae. Clamp-connections indistinct, if present sparse.

Habitat & distribution

  Rather rare, terrestrial on mosses and grasses. Known from Great Britain and The Netherlands.

Remarks

  Coprinus semitalis can be recognised by the narrowly spores with conical base with a very broad, smooth episporium and the absence of >narcotic= smell.