Kees Uljé Coprinus site

Coprinus species (C.M. den Held-Jager 1276)

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Macroscopic features

  Closed pileus up to 4 x 3 mm, at centre brown (K. & W. 7E2, 7D3). Lamellae narrowly adnate, thin, brownish grey (K. & W. 7F2); L= rather few. Stipe 16-18 x 0.5 mm, whitish, somewhat tomentose at base (descr. den Held-Jager).

Microscopic features

  Spores [20,1,1] 12.6-16.0 x 8.2-9.4 µm, av. L= 13.8, av. B= 8.8 µm, Q= 1.50-1.70, av. Q= 1.60, ellipsoid to ovoid; germ pore distinctly eccentric, c. 2 µm wide. Basidia 4-spored. Pseudoparaphyses not noted. Cheilocystidia 25-40 (-50) x 7-11 µm, lageniform with (sub)cylindrical to slightly tapering neck and 2-4 µm wide apex. Pleurocystidia absent. Pileocystidia 30-70 x 7-12 µm, lageniform with cylindrical to slightly tapering neck and 2-5 µm wide apex. Sclerocystidia sparse. Clamp-connections present.


  On wood-chip at stony road-side with many pieces of wood and stems of flowering plants. Among Campanula, Rhinanthus, Gentiana lutea and Rhododendron. Till now only known from Andorra.


  This species is characterized by large, broad spores in combination with lageniform cheilocystidia and four-spored basidia. Other species that have large spores in combination with lageniform cheilocystidia are C. amphithallus and C. singularis. Both species have 2-spored basidia and in C. amphithallus the spores are distinctly smaller and the pileo- and cheilocystidia are more tapering towards the apex. In C. singularis the germ pore is central and the shape of the spores is different.
  The closest species is probably C. subimpatiens, which also has pileocystidia with a more or less cylindrical neck, but in that species the lageniform cheilocystidia are intermixed with globose ones and the smaller spores have a germ pore that is not so strongly eccentric.

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Edited for the Web with help from Marek Snowarski Fungi of Poland site