Macroscopic features

  Closed pileus up to 3.5 x 2.5 mm, in most cases somewhat smaller, first conical then plano-convex, finally applanate and then up to 8 mm wide, completely white-powdery, soon becoming greyish. Lamellae, L = 11-18, l = 0-1, free, white at first then grey to blackish spotted. Stipe up to 35 x 0.2-1 mm, with subbulbous base, whitish-hyaline, covered with white velar flocculi. Smell absent.

Microscopic features

  Spores [120,6,3] 6.7-9.7 x 4.7-6.8 µm, Q = 1.30-1.75, av. Q = 1.50-1.55, av. L = 8.0-8.8 µm, av. B = 5.1-5.9 µm, broadly ellipsoid to oval, rather pale red-brown, with central germ pore. Basidia 16-28 x 6.5-8 µm, 4-spored, surrounded by 4-5 pseudoparaphyses. Pleurocystidia 25-55 x 14-28 µm, (sub)globose, ellipsoid, utriform or vesiculose. Cheilocystidia 25-50 x 16-28 µm, similar to pleurocystidia. Veil on pileus consisting of smooth or somewhat granular globose and 12-42 µm wide elements and ellipsoid to oval elements, up to 50 x 38 µm, mixed with frequently branching, colourless, thin-walled hyphae with processes. Clamp-connections absent.

Habitat & distribution

  Terrestrial in lawn, solitary or a few together. Very rare, known only from type-locality.

Remarks

  Coprinus idae is a very small, white species like C. pseudocortinatus. The latter has narrower, differently shaped spores, larger pleurocystidia, and grows on pure dung.