Macroscopic features

  Pileus 3 x 2 mm when still closed, up to 6 mm when expanded, ovoid, ellipsoid or conical, whitish with dark grey-brown centre. Veil breaking up in small, grey-brown, radial fibrillose, hairy scales. Colour of centre of pileus beige-brown (Mu. 7.5 YR 6/2; K. & W. 7C2), scales when young pale reddish-brown (Mu. 5 YR 5/3; K. & W. 8D3), later darker brown (Mu. 7.5 YR 4/2; Me 8E3). Lamellae, L = c. 24, l = 0-3, rather crowded, free, first white, then grey to blackish. Stipe up to 20 x 0.5-1 mm, white, greyish white, somewhat floccose at clavate base.

Microscopic features

  Spores [40,2,1] 6.7-10.3 x 6.7-8.4 µm, medium red-brown, short ovoid or mitriform, truncate, with central, 1.0-1.3 µm wide germ pore; Q = 1.00-1.35, av. Q = 1.10-1.15; av. L = 8.4-8.8, av. B = 7.6 µm. Basidia 16-25 x 7-10 µm, 4-spored, surrounded by 4-6(-7) pseudoparaphyses. Pleurocystidia 90-165 x 18-32 µm, (sub)cylindrical or oblong. Cheilocystidia 30-120 x 10-34 µm, (sub)cylindrical, oblong or (broadly) ellipsoid. Elements of veil thick-walled, strongly multiple-branched and diverticulate, 2-10 µm wide; walls more than 1.5 µm thick (up to 3 µm) in places and then dark brown. Clamp-connections present.

Habitat & distribution

  Solitary or a few together on dead grass; very rare. Only found once.

Remarks

  Coprinus spec. Uljé 947 differs from C. friesii in dark brown walls of elements of veil and short mitriform spores.