Closed pileus up to 35 x 25 mm, ochre-brown (Mu. 7.5 YR 4.5/4 to 10 YR 6/4, K.& W. 6D4.5 to 5D4) with dark reddish brown centre (Mu. 5 YR 3/4, K.& W. 7E5), usually campanulate to convex, up to 40 mm in diam. when mature, seldom entirely flat, with ochre-brown, granular-flocculose veil. Lamellae narrowly adnate, whitish, dark brown to blackish; L and l not noted. Stipe 40-80 x 2-5 mm, whitish, pubescent.
  Spores [80,4,4] 10.2-15.0 x 7.2-10.0 µm, av. L = 12.1-12.9, av B = 7.3-8.4 µm, Q = 1.40-1.70(-1.90), av. Q = 1.50-1.65, ovoid in front view, amygdaliform in side view, ornamented with rows of small warts or with larger, more isolate warts, truncate; germ pore central, c. 2.2 µm wide. Basidia 20-60 x 8-11 µm, 4-spored. Pseudoparaphyses (4)5-6 per basidium. Cheilocystidia 45-90 x 16-30 µm, lageniform or conical to fusiform with tapering neck and 5-8 µm wide apex. Pleurocystidia absent. Pileocystidia 60-150 x 20-35 µm, lageniform with tapering neck, 6-8.5 µm wide at apex. Velar spherocysts on pileipellis globose to ovoid, up to 45 µm long. Clamp-connections not found. (M. Lange (1952: 127) does mention clamps).

Habitat

  On rich, clayey soil, usually fasciculate. Rather rare.

Remarks

  Coprinus silvaticus is easily recognized by the verrucose, amygdaliform spores in combination with the four-spored basidia. It has comparatively large fruit-bodies. Coprinus verrucispermus, the other species in the Setulosi with verrucose spores, has distinctly smaller fruit-bodies and two-spored basidia. Moreover, the spores in that species are more ellipsoid to only slightly amygdaliform. The warty appearance of the spores of C. verrucispermus disappears in KOH, that of C. silvaticus not.