Kees Uljé Coprinus site

Coprinus fluvialis Lanconelli & Uljé

Coprinus fluvialis Lanconelli & Uljé, Persoonia 16: 297. 1997.

[Copyright © by L. Lanconelli]

  Pileus 5-9 x 3-5 mm when still closed, subglobose, ellipsoid or ovoid, then obtusely conical to convex, finally flattened and 10-15 mm wide, densely covered with white to brownish (at centre) veil when young; centre of pileus grey-brown to dark grey below veil. Lamellae L = 26-30, l = 0-3, free, white to blackish. Stipe 20-30 x 1 mm, white, flocculose; base somewhat clavate.
  Spores [60,3,2] 6.9-10.6 x 5.3-7.8 µm, ovoid or obovoid, often conical to base (submitriform) with rounded apex, medium red-brown and central, 1.3 µm wide germ pore; Q = 1.23-1.45, av. Q = 1.29-1.35; av. L = 7.5-9.5, av. B = 5.8-7.1 µm. Basidia 14-40 x 7-9 µm, 4-spored (a few 2-spored basidia also are found) surrounded by 3-6 pseudoparaphyses. Pleurocystidia 40-55 x 19-28 µm, subglobose, ellipsoid or short broadly cylindrical. Cheilocystidia 30-55 x 17-32 µm, (sub)globose, ellipsoid, ovoid, obovoid or short broadly cylindrical. Elements of veil 20-50 x 2-7 µm, diverticulate, thin-walled, strongly incrusted. Pileipellis hyphoid, made up of cylindrical to inflate elements. Clamp-connections present, but difficult to see because of the very thin and not coloured walls.

Habitat & distribution

  Solitary, in small groups, close together but not fasciculate, on bare soil, sludge. Only known from one location.


  The size of the spores is very variable in these collections. The collection 8-87 consists of old basidiocarps in which the spores are smaller than in the other collection.
  The material is close to C. epichloeus but differs in shape and quotient of the spores and sizes and shape of the cystidia.

Copyright © by Kees Uljé
Edited for the Web with help from Marek Snowarski Fungi of Poland site