On the type of Coprinus piepenbroekii
Back to Index type studies
Original description

Coprinus piepenbroekii Uljé & Bas in Persoonia - Vol. 15, Part 3: 365. 1993.
Pileus 10-20 mm latus, centro mox obscure brunneus, velo ochraceo vel viridi-ochraceo, fibrilloso vel fibrilloso-squamuloso obtectus. Lamellae liberae, subdistantes, primo albidae vel griseo-brunneae, postea nigrae. Stipes 20-40 x 1-2 mm, deorsum subincrassatus, basi subbulbosus, albidus.
Sporae 11.9-15.3 x 7.7-10.5 µm, amygdaliformes, apice truncatae, obscure rubro-brunneae, poro germinativo centrali instructae. Basidia bispora. Pleurocystidia 55-90 x 22-40 µm, subglobosa, vesiculosa, ellipsoidea vel utriformia. Cheilocystidia 40-85 x 25-45 µm, (sub)globosa vel ellipsoidea, interdum oblonga. Pileipellis ex hyphis repentibus, 2-15 µm latus, cylindricis vel inflatis consians. Hyphae veli ramosae. tenui-tunicatae, 3-9 µm, interdum ad 12 µm latae, disperse diverriculatae; diverticula ad 15 µm longa, 1-4 µm lata, apice rotundata. Fibulae adsunt. Typus: 'Netherlands, prov. Gelderland, Wilp, 22.VII.1974. J.H. & G. Piepenbroek 787 (L).'

Pileus up to 10 x 7 mm when still closed, first ellipsoid to ovoid, then conical, finally flattened with reflexed margin, 10-20 mm wide when expanded, soon dark brown at centre, covered with ochraceous veil often with greenish hue and outside centre splitting up into small flocculose scales. Lamellae free, white to greyish brown, finally black. Stipe 20-40 x 1-2 mm, whitish, hollow, slightly thickening towards subbulbose base.
Spores [60.3,1] 11.9-15.3 x 7.7-10.5 µm, av. L = 12.7-13.8, av. B = 8.4-9.4 µm; Q = 1.30-1.60, av. Q = 1.45-1.50, amygdaliform, dark red-brown, with central, c. 2.5 µm wide germ pore. Basidia 15-32 x 9-12 µm, 2-spored. Pseudoparaphyses 4-6 around each basidium. Pleurocystidia 55-90 x 22-40 µm, subglobose, ellipsoid, vesiculose or utriform. Cheilocystidia 40-85 x 25-45 µm, (sub)globose or ellipsoid, sometimes elongate. Pileipellis consisting of repent hyphae made up of cylindrical to somewhat inflated, 2-15 µm wide elements. Elements of suprapellis in part diverticulate. Veil on pileus consisting of branched, hyaline, non-incrusted, thin-walled hyphae, 3-9 µm wide, but sometimes up to 12 µm wide in places with cylindrical diverticulations with rounded apex, up to 15 µm in length and 1-4 µm wide. Clamp-connections present. Habitat. Gregarious on burnt ground.

Collection examined. NETHERLANDS: prov. Gelderiand, Wilp, Wilpse Dijk, 22 July 1974, J.H. & G. Piepenbroek 787 (holotype, L).

The macroscopical description is derived from the dried material and a colour slide; no descriptive notes are available. There only was a note that the veil had a distinct greenish tinge. Microscopically the green pigmentation could not been found in the elements of the veil. Coprinus piepenbroekii is easily recognized by its microscopical features: large, amygdaliform spores in combination with diverticulate elements of the veil and two-spored basidia.
Up
Up