Macroscopic features

  Closed pileus up to 22 x 16 mm, yellow-brown to ochre-brown at centre (Mu. 10 YR 4/6, 2.5 Y 6/8, K. & W. 5D5 to 4A/B7), paler towards margin, up to c. 35 mm in diam. when expanded. Lamellae free, narrow, white to blackish; L = c. 36., l = 1-3(-5). Stipe 40-100 x 1-3(-4) mm, white to greyish-white, pubescent.

Microscopic features

  Spores [60,2,2] 10.6-14.2 x 6.7-8.4 µm, av. L= 12.1-12.6, av. B= 7.4-7.9 µm, Q= 1.35-1.80, av. Q= 1.55-1.70, ellipsoid to ovoid; germ pore eccentric, c. 2 µm wide. Basidia 18-38 x 8-10 µm, 4-spored. Pseudoparaphyses 4-6(-7) per basidium. Cheilocystidia 20-60 x 20-50 µm, globose, ellipsoid, ovoid to obovoid. Pleurocystidia absent. Pileocystidia 40-120 x 8-16 µm, lageniform with cylindrical to sometimes slightly tapering neck and equal, 3-8 µm wide apex. Sclerocystidia present, usually numerous. Clamp-connections present.

Habitat

  Terrestrial on lawns, but also on wood-chips, usually fasciculate. Rather rare.

Remarks

  The species most closely related to C. sclerocystidiosus are C. callinus and C. subpurpureus.
  Coprinus callinus can be distinguished by its tapering pileocystidia and its somewhat smaller spores (9.3-13.1 x 5.7-7.4 ćm versus 10.6-14.2 x 6.7-8.4 ćm). The density of the sclerocystidia is not always the same in each species which has them. In C. sclerocystidiosus they are usually abundant, but in C. callinus they can sometimes be abundant.
  The main differences between C. sclerocystidiosus and C. subpurpureus are the colour of the pileus (yellow-brown to ochre-brown versus red-brown to purple-brown) and the abundant versus scarce sclerocystidia. In addition the pileocystidia of C. sclerocystidiosus are not or very rarely enlarged at the apex as they often are in C. subpurpureus.