On the type of Coprinus bellulus
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Original description
Coprinus bellulus Uljé, C.B. in Four new species of Coprinus from the Netherlands. In Persoonia 13, Part 4: 481. 1988.

Pileus ad 27 mm latus, sulcatus, initio albo- vel cremeo-pulverulentus, postea sordide albidus. Lamellae 22-36, liberae, primo albae, dein cinereae vel atro-maculateae. Stipes ad 65 x 2.5 mm, albo-flocculosus, basi subbulbosus saepe brunneolus. Sporae 7.3-10.6 x 5.8-8.0 x 5.0-7.1 µm, late ellipsoideae, interdum latere leviter applanatae, obscure rubro-brunneae, poro germinale centrico praeditae. Basidia bispora. Cystidia nulla. Velum pilei constans ex cellulis globosis, ad 50 µm latis, hyalinis vel flavidulis tenuitunicatis, granulosis (granula in HCl dissoluta). Fibulae adsunt.
Typus: 'Netherlands, prov. Zuid-Holland: Langeraar, 16 X 1986, C.B. Uljé 777 (L).
Etymology: bellulus, pretty.

Closed pileus subglobose to ellipsoid, up to 11 mm high and 9 mm wide, completely covered with powdery white veil, but very young buds and centre of pileus of more advanced stages often cream to pale ochraceous; veil at margin, particularly in early stages somewhat more hairy-floccose; expanded pileus up to 27 mm wide, convex or flat with slightly deflexed margin, rarely totally flat; with age veil on pileus greying. Lamellae (L= 22-36, l= 1-3) free, up to 2 mm wide, at first white, later greyish to grey with blackish spots. Stipe up to 65 x 2.5 mm, attenuate upwards, at apex up to 1.5 mm wide, white but at apex often somewhat hyaline and at subbulbous, up to 3.5 mm wide base often brownish, with white velar flocks. Smell absent. Spore print dark chocolate brown (Munsell 5 YR 2/1).
Spores [160/8/8] 7.3-10.6 x 5.8-8.0 x 5.0-7.1 µm, Q= 1.20-1.65, av. Q= 1.38-1.50, L=9.6-9.9, B=6.6-7.1 µm, in face view broadly ellipsoid, sometimes with slightly flattened side, but often somewhat irregularly shaped, with central germ pore and apex somewhat attenuate, dark red-brown. Basidia 15-32 X 7-9 µM, 2-spored, surrounded by 3-5 pseudoparaphyses. Cheilo- and pleurocystidia absent but here and there sterile cells (probably somewhat enlarged basidioles) projecting from lamellae (Figs. 1D and 1H) and sometimes velar remnants sticking to lamella edge. Pileipellis made up of ventricose, ellipsoid and subglobose cells covered by about 7 µm wide hyphae consisting of oblong-ventricose cells and these upwards passing into thin-walled colourless to slightly yellowish, smooth to granular, up to 50 µm wide, globose velar cells; granules on surface of velar cells disappearing in HCl. Clamp-connections present.
Habitat & distribution. - Mostly in small groups, more rarely in bundles of up to 40 specimens, but sometimes also solitary. Usually on bare soil, but sometimes also at grassy-mossy places, always under shrub or trees. Not rare in the Netherlands.

C o l l e c t i o n s e x a m i n e d. - NETHERLANDS: prov. Flevoland: Oostelijk Flevoland, Bremerbergbos, 4 Oct. 1986, G. Tjallingii (herb. Tjallingii); prov, Zuid-Holland: Alphen a/d Rijn, 26 June 1984, Uljé 320, 1 Aug. 1985, Uljé 530 & 11 Sept. 1987, Uljé 827 (L); Leiden 28 Aug; 1986, Uljé 648 & 31 May 1987, Uljé 849 (L); Ter Aar, Langeraar, 10 Nov, 1983, Uljé 308 & 16 Oct. 1986, Uljé 777 (type; L). (All collections in herb. Uljé unless otherwise mentioned.)

Coprinus bellulus is easily distinguished from the other members of the C. cortinatus-group by the 2-spored basidia, lacking pleuro- and cheilocystidia, and the often somewhat irregular, broadly ellipsoid spores.
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